Entering the Military with 0 debt

I am a single 21-year-old who is joining the ARMY with the intention of making a career out of it & "retiring" around 45. While I have no debt, I also do not own a home. My question is: are there any military saving's plans/ money holding tools I can funnel my base pay into to grow my money until I retire?

I don't know ANYTHING, so any help will be appreciated.