Ahh, St.Croix and 33 is the clue, Americans didn't have a field at St. Croix, Brits did

GreyCap is the handle of my absolute favorite fighter pilot of WWII. I read his book like it's a bible.
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//Greycap from red two, 2 109's turning in behind you//
//nothing behind Greycap, your all clear. Whats that now 33? beers on me at st. Croix//
Any guesses who Greycap was? <G>