There are around 19 million U.S. veterans as of this year, representing less than 10% of the total U.S. adult population, according to data from the Department of Veterans Affairs. Here are a few key facts about those who have served in the military and how this population is changing. 1. Gulf War-era veterans now account for the largest share of all U.S. veterans, having surpassed Vietnam-era veterans in 2016. 2. The share of the U.S. population with military experience is declining. 3. The number of female veterans is projected to increase slightly, from around 2 million in 2021 to approximately 2.2 million in 2046.