Marines and government civilians gather around a Composite Tracking Network being tested during Weapons and Tactics Instructor Course 1-16 at Barry M. Goldwater Range, Oct. 20, 2015. The CTN works to compile and share data between multiple air command locations utilizing the Command Aviation Command and Control System. (Official Marine Corps photo by Lance Cpl. Thomas Mudd/Released) - Marines and government civilians gather around a Composite Tracking Network being tested during Weapons and Tactics Instructor Course 1-16 at Barry M. Goldwater Range, Oct. 20, 2015. The CTN works to compile and share data between multiple air command locations utilizing the Command Aviation Command and Control System. (Official Marine Corps photo by Lance Cpl. Thomas Mudd/Released)