blue suit

Noun

 * 1)  A member of military personnel at an air base.
 * 2) * Bill Sulzman quoted in 2012, David Keen, Useful Enemies
 * Inside Schriever and Peterson [air force bases], a lot of the military contractors are working alongside the blue suits.

Usage notes

 * Also expressed as an item of clothing being worn, with the same implication: "the men/guys/folks in [the] blue suits", etc.