My pops. Japan, pre Vietnam
Gramps on my mom's side, World War II
Gramps on my pop's side, World War I
Pops-in-law (the one in the beard), Vietnam
In addition, the one's I don't have pictures for, great, great Gramps, American Civil War and great, great, great, great Gramps, American Revolution.
Thanks to each and every one of you, and all the others that have served.