Complex sentence: Loadmasters serve in the Air Force, Marines, Coast Guard and Navy of many nations or many civilian airliners; these include the USAF, RAF, IRIAF, RCAF, RAAF, Australian Army, IAF, IRIN and RNZAF.
Split into simpler sentences: Loadmasters serve in the Air Force, Marines, Coast Guard and Navy of many nations or many civilian airliners. These include the USAF, RAF, IRIAF, RCAF, RAAF, Australian Army, IAF, IRIN and RNZAF.