WW 1: Democrat president 116,500 American dead
WW 2: Democrat President 405,400 American dead
Korea: Democrat President 35,500 American dead
Vietnam: Mostly Democrat took and Republican to get us out 58,200 American dead
Dems don't have a great record of being anti war. BTW - as a Senator Hillary voted yes on every military action. Here is a list of American casualties going back to the Revolution from out British oppressors. You can figure out who and what party was in office at the time. It is eye opening.
The eye watering one was the civil war which was a Republican, however I don't think it would have mattered who was in office it was going to be bad either way.
https://en.wikipedia.org/wiki/United_States_military_casualties_of_war