In 2017 total U.S. military personnel numbered 2,363,675 with 1,373,650 active and 990,025 in reserve. (DoD photo by Petty Officer 1st Class Daniel N. Woods, U.S. Navy).                                                                                                                                                                                                                                                                                  

 

https://www.statista.com/statistics/232330/us-military-force-numbers-by-service-branch-and-reserve-component/

 

Ike on D-Day (Wikimedia Commons)

US MILITARY PERSONNEL (1939-1945)

Year Army Navy Marines Coast Guard Total
1939 189,839 125,202 19,432 334,473
1940 269,023 160,997 28,345 458,365
1941 1,462,315 284,427 54,359 1,801,101
1942 3,075,608 640,570 142,613 56,716* 3,915,507
1943 6,994,472 1,741,750 308,523 151,167 9,195,912
1944 7,994,750 2,981,365 475,604 171,749 11,623,468
1945 8,267,958 3,380,817 474,680 85,783 12,209,238

*Coast Guard listed only as wartime strength