>>3909273 (LB)
Stahp
https://www.facebook.com/pages/South-Mountain-Speedway/168378883215905
it means ""Not Scared""
….After the movie the men went to the post beer garden to further calm their nerves, and after a few hours were feeling pretty courageous. Strolling back to camp, Private Eberhardt announced that he expected the next day’s jump to be no different than any other. His friends immediately began to razz him, saying he’d be so scared he’d barely remember his name. This ticked off the six-foot-eight Eberhardt, who was known for his confidence and powers of concentration. According to Gerard M. Devlin, author of Paratrooper! (1979), he declared, "All right, dammit! I tell you jokers what I’m gonna do! To prove to you that I’m not scared out of my wits when I jump, I’m gonna yell `Geronimo’ loud as hell when I go out that door tomorrow!"
https://www.straightdope.com/columns/read/1119/why-do-parachutists-yell-geronimo/