No one has mentioned ROTC; I do not know if your school offers, or is affiliated with a NROTC school, you may want to look into it ( of course you then have that obligation)
NROTC has the Marine option also, or there is the Marine Corps OCS/PLC program which used to offer tuition.
For aquaregia: the only reasonable way to pay for school is to have wealthy parents, go to whatever school offers you a scholarship, or put it off while you save the money.
I worked my tail off to earn a Master's and PhD as a police officer, without incurring any debt. My wife earned her Master's contiguous with my schooling.
We had a couple of kids in the mix also. I wrote most of my dissertation with one hand while my youngest sat on my lap. Her bedtime stories were from Campbell and Stanley on experimental and quasi experimental methodology...
It can be done, it just takes planning and a willingness to sacrifice