diff --git a/.gitignore b/.gitignore
index 001c426..9c79f62 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
 *.pyc
 cmdUtil
 .DS_Store
-Subsystems/cmdGui/CHeaderParser.py
-Subsystems/cmdGui/CHeaderParser.py
\ No newline at end of file
diff --git a/GroundSystem.py b/GroundSystem.py
index 29fe5cd..3688960 100644
--- a/GroundSystem.py
+++ b/GroundSystem.py
@@ -38,7 +38,6 @@
 # CFS Ground System: Setup and manage the main window
 #
 class GroundSystem(QMainWindow, Ui_MainWindow):
-
     #
     # Init the class
     #
@@ -76,7 +75,6 @@ def getSelectedSpacecraftName(self):
     #
     def DisplayErrorMessage(self, message):
         print(message)
-        # alert = QMessageBox()
         self.alert.setText(message)
         self.alert.setIcon(QMessageBox.Warning)
         self.alert.exec_()
@@ -104,14 +102,18 @@ def startCmdSystem():
             ['python3', f'{ROOTDIR}/Subsystems/cmdGui/CommandSystem.py'])
 
     # Start FDL-FUL gui system
-    #def startFDLSystem(self):
-    #    selectedSpacecraft = self.getSelectedSpacecraftName()
-    #    if selectedSpacecraft == 'All':
-    #        subscription = ''
-    #        self.DisplayErrorMessage('Cannot open FDL manager.\nNo spacecraft selected.')
-    #    else:
-    #       subscription = '--sub=GroundSystem.' + selectedSpacecraft
-    #       os.system('( cd Subsystems/fdlGui/ && python FdlSystem.py ' + subscription + ' ) & ')
+    def startFDLSystem(self):
+        selectedSpacecraft = self.getSelectedSpacecraftName()
+        if selectedSpacecraft == 'All':
+            subscription = ''
+            self.DisplayErrorMessage(
+                'Cannot open FDL manager.\nNo spacecraft selected.')
+        else:
+            subscription = f'--sub=GroundSystem.{selectedSpacecraft}'
+            subprocess.Popen([
+                'python3', f'{ROOTDIR}/Subsystems/fdlGui/FdlSystem.py',
+                subscription
+            ])
 
     # Update the combo box list in gui
     def updateIpList(self, ip, name):
diff --git a/Guide-GroundSystem.md b/Guide-GroundSystem.md
index f8bae56..a139c80 100644
--- a/Guide-GroundSystem.md
+++ b/Guide-GroundSystem.md
@@ -23,13 +23,13 @@ Future enhancements:
 ## Install and run
 
 Before launching the Ground System make sure that:
-- PyQt4 is installed,
+- PyQt5 is installed,
 - PyZMQ is installed,
 - cmdUtil is compiled.
 
 Installing and running cFS Ground System on Ubuntu:
 
-1. ```sudo apt-get install python3-pyqt4```
+1. ```sudo apt-get install python3-pyqt5```
 1. ```sudo apt-get install python3-zmq```
 1. ```sudo apt-get install libcanberra-gtk-module```
 1. ```cd Subsystems/cmdUtil/ && make```
@@ -46,7 +46,7 @@ This section was made to help developers who are adding core Flight Software (cF
 The `CHeaderParser.py` program that should be found in:
 
 ```GroundSystem/Subsystems/cmdGui```
- 
+
 Is an interactive, command-line based program to help walk developers through the process of adding custom cFS applications to the Ground System. Along with `CHeaderParser.py` is a configuration file that CHeaderParser uses to find the proper header files for your "new" cFS application. This file is named `CHeaderParser-hdr-paths.txt`, and should be placed in the same directory as `CHeaderParser.py`.
 
 Expected file structure:
diff --git a/RoutingService.py b/RoutingService.py
index 66b9e7d..47139ca 100644
--- a/RoutingService.py
+++ b/RoutingService.py
@@ -120,8 +120,6 @@ def forwardMessage(self, datagram, hostName):
     def getPktId(datagram):
         # Read the telemetry header
         streamId = unpack(">H", datagram[:2])
-        # Uncomment the next line to debug
-        # print("Packet ID =", hex(streamId))
         return hex(streamId[0])
 
     # Close ZMQ vars
diff --git a/Subsystems/cmdGui/CHeaderParser.py b/Subsystems/cmdGui/CHeaderParser.py
index fcd48bd..52fd4dc 100644
--- a/Subsystems/cmdGui/CHeaderParser.py
+++ b/Subsystems/cmdGui/CHeaderParser.py
@@ -103,12 +103,6 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
                 l = l.strip()
                 if l and not l.startswith("#"):
                     paths.append(l)
-                # Don't worry about comment lines
-                # if line.find('#') == -1:
-                # Don't worry about empty lines
-                # if line != '':
-                # Add line to list of paths
-                # paths.append(line)
             print(f"Using header files found in {filename}")
             # Send paths back to caller function
             return paths
@@ -149,8 +143,6 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
             for single_line in single_hdr:
                 master_hdr.append(single_line)
 
-    #print "Master Header Length: " + str(len(master_hdr))
-
     # Reads and saves command and parameter information
     # Look through each line of the header file for command definitions
     for single_line in master_hdr:
@@ -180,9 +172,6 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
                 # structure
                 single_line = single_line[:single_line.rfind('//')]
 
-            #else:
-            #	print "Did not find any comments in definition."
-
             # Split single line into list for indexing
             definition = single_line.split()
 
@@ -195,30 +184,15 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
                 cmdDesc.append(definition[1])
                 cmdCodes.append(definition[2])
 
-            #else:
-            #	print "length not 3, see line below"
-            #	print definition
-
-    #print ("List of Command Descriptions Below:")
-    #print (cmdDesc)
-    #print ("--------------------------------------------------------------")
-    #print ("List of Command Codes Below:")
-    #print (cmdCodes)
-    #print ("--------------------------------------------------------------")
-
-    print(
-        "We need to save the command into to a pickle file in 'CommandFile/'. "
-    )
-    print(
-        "Please do not use any spaces/quotes in your filename. Ex: my_app_cmd_file"
-    )
+    print(("We need to save the command into to a pickle file "
+           "in 'CommandFile/'.\nPlease do not use any spaces/quotes "
+           "in your filename. Ex: my_app_cmd_file"))
     cmd_file_name = input(
         "What would you like the command file to be saved as? ")
 
     # starting from last index (-1) going backward
     # (from example above) file_split[-2] = app_msg
     # therefore picklefile = CommandFiles/app_msg
-    #pickle_file = 'CommandFiles/'+file_split[-2]
     pickle_file = f'{ROOTDIR}/CommandFiles/{cmd_file_name}'
 
     # Open pickle file for storing command codes/descriptions
@@ -456,14 +430,8 @@ def getFileList(filename='CHeaderParser-hdr-paths.txt'):
 
                     print("Array size:", array_size)
 
-                    # Set flag initially to false in order to get into while loop
-                    # array_size_within_limit = False
-
-                    # Check conditions before loop to see if loop is even necessary
-                    # array_size_within_limit = array_size.isdigit() and int(
-                    #     array_size) in range(129)
-
-                    # This while loop will make sure that the user input is both
+                    # This while loop will make sure that
+                    # the user input is both
                     # - a valid integer
                     # - between 0 and 128 (inclusively)
                     while not array_size.isdigit() or int(
diff --git a/Subsystems/cmdGui/CommandSystem.py b/Subsystems/cmdGui/CommandSystem.py
index 2f3430b..710d780 100644
--- a/Subsystems/cmdGui/CommandSystem.py
+++ b/Subsystems/cmdGui/CommandSystem.py
@@ -76,7 +76,7 @@ def checkParams(idx):
         pickle_file = f'{ROOTDIR}/ParameterFiles/{quickParam[idx]}'
         try:
             with open(pickle_file, 'rb') as pickle_obj:
-                _, paramNames, _, _, _, _ = pickle.load(pickle_obj)
+                paramNames = pickle.load(pickle_obj)[1]
             return len(paramNames) > 0
         except IOError:
             return False
diff --git a/Subsystems/cmdGui/HTMLDocsParser.py b/Subsystems/cmdGui/HTMLDocsParser.py
index 455f4ad..f932954 100644
--- a/Subsystems/cmdGui/HTMLDocsParser.py
+++ b/Subsystems/cmdGui/HTMLDocsParser.py
@@ -17,21 +17,14 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-import sys
-import csv
-import getopt
-import subprocess
-import shlex
-import re
+
 import glob
 import pickle
-
+import re
 from html.parser import HTMLParser
-from struct import *
 
 
 class HTMLDocsParser(HTMLParser):
-
     #
     # Initializes allData variable
     #
@@ -42,15 +35,16 @@ def reset(self):
     #
     # Appends HTML file content to allData variable
     #
-    def handle_data(self, text):
-        if text.strip() != '':  # excludes new lines
-            self.allData.append(text.strip())
+    def handle_data(self, data):
+        if data.strip():  # excludes new lines
+            self.allData.append(data.strip())
 
     #
     # Determines UNIX data type of parameter
     #
-    def findDataTypeNew(self, dataTypeOrig, paramLen):
-        if paramLen != '':  # assumes all string types have length enclosed in brackets
+    @staticmethod
+    def findDataTypeNew(dataTypeOrig, paramLn):
+        if paramLn:  # assumes all string types have length enclosed in brackets
             return '--string'
         if dataTypeOrig in ('uint8', 'boolean'):
             return '--byte'
@@ -65,25 +59,25 @@ def findDataTypeNew(self, dataTypeOrig, paramLen):
     #
     # Determines character array size for string types
     #
-    def findStringLen(self, keyword):
+    @staticmethod
+    def findStringLen(kywd):
         hdr_files = glob.glob('../../../build/cpu1/inc/*.h')
         hdr_files += glob.glob('../../fsw/cfe-core/src/inc/cfe_*.h')
         hdr_files += glob.glob('../../fsw/mission_inc/cfe_mission_cfg.h')
         val = ''
         found = False
-        i = 0
+        k = 0
 
-        while not found and i < len(hdr_files):
-            with open(hdr_files[i]) as hdr_obj:
+        while not found and k < len(hdr_files):
+            with open(hdr_files[k]) as hdr_obj:
                 file_lines = hdr_obj.readlines()
-                j = 0
-                while found == False and j < len(file_lines):
-                    if '#define ' + keyword in file_lines[j]:
+                l = 0
+                while not found and l < len(file_lines):
+                    if f'#define {kywd}' in file_lines[l]:
                         found = True
-                        val = file_lines[j].split()[2]
-                    j += 1
-            i += 1
-
+                        val = file_lines[l].split()[2]
+                    l += 1
+            k += 1
         return val
 
 
@@ -104,7 +98,7 @@ def findStringLen(self, keyword):
         with open(html_file) as file_obj:  # opens HTML file
             reader = file_obj.read()  # reads HTML file
             parser.feed(reader)  # feeds file contents to parser
-            data = parser.allData
+            allData = parser.allData
 
             dataTypesOrig = []  # uint8, uint16, uint32, char, boolean
             paramNames = []  # parameter name
@@ -114,32 +108,35 @@ def findStringLen(self, keyword):
             stringLen = []  # evaluated parameter length
 
             try:
-                i = data.index("Data Fields") + 1
-                j = data.index("Detailed Description")
-                while i < j:  # iterates through lines between Data Fields and Detailed Description
-
+                i = allData.index("Data Fields") + 1
+                j = allData.index("Detailed Description")
+                # iterates through lines between Data Fields and Detailed Description
+                while i < j:
                     # skips header parameters
-                    if 'Header' in data[i + 1] or 'Hdr' in data[i + 1]:
+                    if any([x in allData[i + 1] for x in ('Header', 'Hdr')]):
+                        # if 'Header' in data[i + 1] or 'Hdr' in data[i + 1]:
                         i += 1
-                        while 'uint' not in data[i] and 'char' not in data[
-                                i] and i < j:
+                        while not any(
+                            [x in allData[i]
+                             for x in ('uint', 'char')]) and i < j:
+                            # while 'uint' not in data[i] and 'char' not in data[
+                            #         i] and i < j:
                             i += 1
 
                     else:
-                        dataTypesOrig.append(data[i])  # stores data type
+                        dataTypesOrig.append(allData[i])  # stores data type
                         i += 1
-                        paramNames.append(data[i])  # stores parameter name
+                        paramNames.append(allData[i])  # stores parameter name
                         i += 1
                         param_len = ''
-                        if '[' in data[i]:
-                            param_len = data[
+                        if '[' in allData[i]:
+                            param_len = allData[
                                 i]  # stores string length if provided
                             i += 1
                         paramLen.append(param_len)
                         desc_string = ''
-                        while 'uint' not in data[i] and 'char' not in data[
-                                i] and i < j:
-                            desc_string = desc_string + ' ' + data[i]
+                        while not any([x in allData[i] for x in ('uint', 'char')]) and i < j:
+                            desc_string = f'{desc_string} {allData[i]}'
                             i += 1
                         paramDesc.append(desc_string.lstrip()
                                          )  # stores parameter description
@@ -152,15 +149,15 @@ def findStringLen(self, keyword):
                         # finds size of character array if type --string
                         keyword = ''
                         if dataTypeNew == '--string':
-                            keyword = re.sub('\[|\]|\(|\)', '',
+                            keyword = re.sub(r'\[|\]|\(|\)', '',
                                              paramLen[-1])  # removes brackets
-                            while keyword.isdigit() == False:
+                            while not keyword.isdigit():
                                 keyword = parser.findStringLen(keyword)
-                                keyword = re.sub('\[|\]|\(|\)', '', keyword)
+                                keyword = re.sub(r'\[|\]|\(|\)', '', keyword)
                         if keyword == '0':
                             keyword = input(
-                                paramLen[-1] +
-                                ' not found. Please enter value manually: ')
+                                f'{paramLen[-1]} not found. Please enter value manually: '
+                            )
                         stringLen.append(keyword)
 
                 print("DATA TYPES:", dataTypesOrig)
@@ -174,7 +171,7 @@ def findStringLen(self, keyword):
                 print("Data Fields not found in HTML file")
 
             # write data to a file
-            file_split = re.split('/|\.', html_file)
+            file_split = re.split(r'/|\.', html_file)
             pickle_file = 'ParameterFiles/' + file_split[-2]
             with open(pickle_file, 'wb') as pickle_obj:
                 pickle.dump([
diff --git a/Subsystems/cmdGui/Parameter.py b/Subsystems/cmdGui/Parameter.py
index 6778075..b069d6b 100644
--- a/Subsystems/cmdGui/Parameter.py
+++ b/Subsystems/cmdGui/Parameter.py
@@ -34,7 +34,6 @@
 
 
 class Parameter(QDialog, Ui_Dialog):
-
     #
     # Initializes Parameter class
     #
@@ -65,12 +64,10 @@ def ProcessSendButton(self):
                 param_list.append(f'{dataType}={input_list[k]}')  # --byte=4
             k += 1
         param_string = ' '.join(param_list)
-        # print(param_string)
         launch_string = (
             f'{ROOTDIR}/../cmdUtil/cmdUtil --host={pageAddress} '
             f'--port={pagePort} --pktid={pagePktId} --endian={pageEndian} '
             f'--cmdcode={cmdCode} {param_string.strip()}')
-        # print launch_string
         cmd_args = shlex.split(launch_string)
         subprocess.Popen(cmd_args)
         self.status_box.setText('Command sent!')
@@ -80,7 +77,6 @@ def ProcessSendButton(self):
 # Main method
 #
 if __name__ == '__main__':
-
     #
     # Initializes variables
     #
diff --git a/Subsystems/cmdGui/UdpCommands.py b/Subsystems/cmdGui/UdpCommands.py
index f520aa9..b5a96ed 100644
--- a/Subsystems/cmdGui/UdpCommands.py
+++ b/Subsystems/cmdGui/UdpCommands.py
@@ -47,9 +47,6 @@
 
 
 class SubsystemCommands(QDialog, Ui_GenericCommandDialog):
-
-    # pktCount = 0
-
     #
     # Init the class
     #
@@ -71,7 +68,7 @@ def checkParams(idx):
         pf = f'{ROOTDIR}/ParameterFiles/{param_files[idx]}'
         try:
             with open(pf, 'rb') as po:
-                _, paramNames, _, _, _, _ = pickle.load(po)
+                paramNames = pickle.load(po)[1]
             return len(paramNames) > 0  # if has parameters
         except IOError:
             return False
@@ -120,7 +117,6 @@ def usage():
 # Main
 #
 if __name__ == '__main__':
-
     #
     # Set defaults for the arguments
     #
diff --git a/Subsystems/tlmGUI/EventMessage.py b/Subsystems/tlmGUI/EventMessage.py
index 9d05702..c067f75 100644
--- a/Subsystems/tlmGUI/EventMessage.py
+++ b/Subsystems/tlmGUI/EventMessage.py
@@ -205,10 +205,6 @@ def usage():
     if not subscription or len(subscription.split('.')) < 3:
         subscription = "GroundSystem"
 
-    # arr = subscription.split('.')
-    # if len(arr) < 3:
-    #     subscription = 'GroundSystem'
-
     print('Event Messages Page started. Subscribed to', subscription)
 
     py_endian = '<' if endian == 'L' else '>'
diff --git a/Subsystems/tlmGUI/GenericTelemetry.py b/Subsystems/tlmGUI/GenericTelemetry.py
index 3510daf..7d7252b 100644
--- a/Subsystems/tlmGUI/GenericTelemetry.py
+++ b/Subsystems/tlmGUI/GenericTelemetry.py
@@ -36,7 +36,6 @@
 
 
 class SubsystemTelemetry(QDialog, Ui_GenericTelemetryDialog):
-
     #
     # Init the class
     #
@@ -77,7 +76,8 @@ def initGTTlmReceiver(self, subscr):
         self.thread.start()
 
     #
-    # This method processes packets. Called when the TelemetryReceiver receives a message/packet
+    # This method processes packets.
+    # Called when the TelemetryReceiver receives a message/packet
     #
     def processPendingDatagrams(self, datagram):
         #
diff --git a/Subsystems/tlmGUI/TelemetrySystem.py b/Subsystems/tlmGUI/TelemetrySystem.py
index 4c9ce23..1e02aa4 100644
--- a/Subsystems/tlmGUI/TelemetrySystem.py
+++ b/Subsystems/tlmGUI/TelemetrySystem.py
@@ -22,7 +22,6 @@
 import csv
 import getopt
 import shlex
-# import socket
 import subprocess
 import sys
 from pathlib import Path
@@ -38,7 +37,6 @@
 
 
 class TelemetrySystem(QDialog, Ui_TelemetrySystemDialog):
-
     #
     # Init the class
     #
@@ -70,8 +68,6 @@ def strToHex(aString):
     # Dump the telemetry packet
     #
     def dumpPacket(self, packetData):
-        # appIdString = f"{ord(packetData[0]):02X}"
-        # appIdString += f"{ord(packetData[1]):02X}"
         appId = (ord(packetData[0]) << 8) + (ord(packetData[1]))
         print("\n-----------------------------------------------")
         print("\nPacket: App ID =", hex(appId))