1) US Army E-3s 2) Certain EMs 3) Certain servicemen 4) Certain soldiers briefly 5) GIs who rank just below cpls 6) Group below cpls 7) Inferiors of cpls 8) Low-ranking GIs 9) Military E-3s 10) NCO subordinates 11) Noncoms 12) One-stripe GI''s 13) One-stripe GIs 14) One-stripers 15) Ones ranking below cpls 
Primary Flying Control System
acronym: perfluorocarbon compounds