I say +1, but only because of the storch. However, I think it should only REARM your fighter (its not a re-fuel pad), and only the guns on your aircraft that share a caliber with one of the GV's.
Basicly the only planes we couldn't rearm would be ones that carry hispanos, russian 20mm, russian 23 or 37mm, russian 12.7mm, 30mm, or specialty weapons such as the 57mm, or 50mm BK.