some of the best people I've ever met were military guys/gals. if it's for you, then go for it!
do you have someone to store the truck for you?
and have you started your daily running/pushups/pullups? if so, put on a 20# backpack and keep going with all 3. then step that up to 30#, the 40#, etc. boot camp is hard enough without needing to also get your arms/legs in shape at the same time.