Given how the army is disproportionately white, male and non-educated this is pretty bad isn't it?
The total military force of the Armed Services (active duty & reserves; enlisted & officer) is 71% white
including Hispanic/Latino servicemembers.
12% of the service is Hispanic/Latino; assuming 3 in 4 fall into the white category, around 62% of the Armed Services is White Non-Hispanic, which is almost identical to the national population as a whole.
However, the military is blacker than the nation as a whole (17%) and so this would explain at least in part why Trump's approval rating wouldn't be higher.
Compared to the 71% figure above,
active duty enlisted members are 67% white. They don't collect information on "Hispanic/Latino" except in the situation of total military force, so we could only guess that among active duty enlisteds, White Non-Hispanics are probably in the high-50s.