The Receiver is the noise-sensitive land use exposed to sound from the source. The FRA horn noise model incorporates all three elements of the noise analysis as they relate to train horns near grade crossings.
I think the most significant part is that it changes a lot. The Air Force is the youngest service with the least clearly defined role. Right now it's aim high and/or fly fight win.. I believe for a moment it was above all but they quickly swatted that good idea fairy due to insufficient Joint-ness.
MAJCOM Challenge Coins. A major command (MAJCOM) represents a major Air Force subdivision having a specific portion of the Air Force mission. Each MAJCOM is directly subordinate to Headquarters Air Force. All of our USAF MAJCOM coins include Velcro backing.