[canucker2016]

The parental bias is two-pronged - officers, many are college-educated, esp. from the various armed forces academies - West Point, Annapolis, et al., and those recruited into the armed forces have to overcome various hurdles, from https://www.nbcnews.com/news/military/every-branch-us-milita...:

"The pool of those eligible to join the military continues to shrink, with more young men and women than ever disqualified for obesity, drug use or criminal records. Last month, Army Chief of Staff Gen. James McConville testified before Congress that only 23% of Americans ages 17-24 are qualified to serve without a waiver to join, down from 29% in recent years.

An internal Defense Department survey obtained by NBC News found that only 9% of those young Americans eligible to serve in the military had any inclination to do so, the lowest number since 2007. "

So out of the possible Americans aged 17-24, less than 2.3% would serve in the military. The partner/spouse may not have to pass those hurdles, but having at least one parent with those attributes and employed would help the family wellbeing.