they specifically target poor and middle class neighborhoods to that end. they even know that some college campuses(the prospects of them finding a job is low) so they often are seen on campus trying to recruit people. STEM job prospects have been so bad for like 10+ years too, if your not going for programming/TECH, bio(health only), and maybe an engineer, dont expect something, if you dont have years of lab experience. they also never target wealthier neighborhoods.

i seen recruiting offices for each branch in different locations. army for a well travelled mall area, and another in less taffic mall, conveniently both are located near public colleges. the only oddball one i saw was a recruiting office near a mall of asian supermarket near the highway.

and then the ones for all the armed forced combined into one in a more obscure area in a financial district.