Also run a search on" predator conditioning’, “SF workouts”., Martin Rooney and Dan John programs.You will have to increase your conditioning,( weighted rucks, sprints, medium level running, etc). No disrespect, but concentrate on the level of requirements to succeed( running, pull ups, push ups, rope climbs, bodyweight exercises, etc) dont get caught up in this crap about “I dont want to lose any muscle mass” Jesus, you are there to learn how to command troops in combat, worry about your squat numbers after you get your bars.