Four months ago, a fresh-outta high school kid approached me about getting him ready to go into Air Force Combat Control. I put him exclusively on a GB type program plus two days a week of underwater training. If you're starting out or considering the GB program, here's what kind of progress that's possible from an untrained state. He just left, so I'm expecting my first letter in a few weeks. We also recently saw a program that a combat controller trainer had written to prep for the training....needless to say after the GB programming trying it was a joke.

5-6 Freestanding HeSPUs
18 L-Sit Pull ups, neutral grip. 7 with wide pull up grip
Consistently over 50 secs on levers
~25 secs tuck planche. Can get a much flatter back and better arms, but gotta be on his case about doing it.
L-sit pic turned out cruddy for some reason. No problem hitting 60 secs, working on L-sit walks. Can hold with hands flat on floor.
"Combat Control" Swim. Hands/feet "tied". 50m swim

Retrieve goggles with mouth while "tied up." Depth of 10 feet, 10 meters out, beginning from standing poolside, jumping in, CC swim to retrieval, 3 full depth bobs, swim to pool edge and spit goggles out.
Various other underwater drills, speed dives, etc. If I can figure out how to convert the videos to a better format, I'll post some of those too with underwater drills and more GB skills. Unfortunately I can't shoot underwater with my camera to show the really fun stuff. ![]()
For Boot Camp, he has only 15ish minutes at night free time, so he's gonna use that time to work on coach's top five exercises, minus the ring series.