Good advise is good advise, regardless of the post count, Marine. Nice post.
As a current CQB instructor, I would advise you to focus on your conditioning and not worry about "making gains". Regardless of what country's armed forces you are joining, the goal is to make it through basic, not what your bench press max is. One thing you need to know, you will be doing a lot of training in full "Battle Rattle" (vest, helmet, gun, pack, etc). That will add a dimension to your training that will really task your endurance. Remember, you are entering a new world now, where your skills/ conditioning will be used to keep you alive and your enemies fucking dead. It you are serious about being a warrior, then focus on training warrior skills, worry about the size of your arms after basic. Good Luck