Racial and ethnic minority groups made up 40% of Defense Department active-duty military in 2015, up from 25% in 1990. (In 2015, 44% of all Americans ages 18 to 44 were racial or ethnic minorities.)
Overall, 15% of DOD active-duty military personnel are women, up from 11% in 1990. In 2015, 17% of active-duty officers were female – up from their share of 12% in 1990. And 15% of enlisted personnel were female in 2015, up from 11% in 1990. The share of women in the ranks varies significantly by service branch. Women comprise nearly one-in-five active-duty personnel in the Air Force (19%) but only 8% of all Marines. Women make up 18% of the Navy and 14% of the Army.
Roughly two-thirds of all DOD active-duty military personnel were ages 30 or younger in 2015. Only about one-in-ten (9%) were older than 40. http://www.pewresearch.org/fact-tank/2017/04/13/6-facts-about-the-u-s-military-and-its-changing-demographics/