Bottom line: DO NOT JOIN.
Reasoning: I would absolutely advise against joining any branch of the military or doing anything else where you are contractually under obligation to the government. I was going to join out of high school and come from a military family and attended military school for 6 years. I did not go in due to a previous surgery preventing me from doing the special operations job I wanted, I didn't want to do anything else so I got out of it. I have family and friends currently in the military and they would echo my opinion. There is a very long list of reasons not to join that others have mentioned above.
Alternative Solutions: There are other masculine careers that you can begin working in with little to moderate education and make enough money to pursue your masculine development yourself. Some of these careers are construction, welding, plumbing, elevator technician, paramedic, firefighter, nurse, nurse practitioner, physician assistant, certified nurse anesthetist (CRNA), IT, truck driver, plane or helicopter pilot, etc. I work in one of the above careers. Ideally you can get an education or certification or both which allow you to be employable in a variety of locations and for a variety of organizations, thus as the Marxist control increases if you are fired from where you work due to not submitting to whatever degenerate agenda or you need to move to a different location for whatever reason, it will be easy for you to find new employment. These careers also have niche areas you can get into which allow you to be specialized in a high demand skill thus you will be harder to fire, more likely to get hired, and possibly able to move into an area of the field which is even better suited to you personally or you as a masculine man.
Masculine Development: Once you obtain a job which provides you enough money to secure whatever housing and transportation solution is right for you whether that be a house, apartment, tiny house, RV, van, truck, tent, hotel, etc. and a vehicle to get to and from work etc. you can begin to use your money for your personal development of your knowledge and skills. You can take shooting courses, scuba diving courses, survival courses, motorcycle courses, farming courses, medical courses, martial arts courses, etc etc. You can take classes on whatever topic you want such as the above ones, religion (hopefully Orthodoxy), medicine, physical training, diet and nutrition, etc. and if you manage your money well you'll have time to do those things as well as whatever else God deems for you to do to grow as a man and to grow your faith.