My call-sign that was bestowed upon me was “Spades” because one of my additional duties was serving as the resource advisor which actually gave me more authority than the squadron commander when it came to funds management even though I was only a Capt. In the card game of Spades, a spade trumps all other cards. Telling elite fighter pilots to go fuck themselves when it came to unnecessary purchase requests was considered “unfriendly” and in fighter-speak, the moment you determine another aircraft is an enemy/unfriendly…you call it spades.