As you said, one main difference is that you can quit your job but not the war. There is a detail: you can experience these feelings even if your job is not toxic.
-- Hawkeye Pierce, M*A*S*H
<https://www.quotes.net/mquote/790330>
War is the job you can't quit.
There are plenty of ways to quit. E.g. deserting, self-wounding. You also got different forms of mutiny and "fragging" officers (not really quiting, but refusing to do the job).
For the last, consider unexploded WWII ordnance routinely uncovered in Germany and the UK (an example of the latter only this week); mines in Vietnam and elsewhere in Southeast Asia, among many other theatres; Agent Orange and other chemicals utilised in various locations (including a sunken trove of mustard gas munitions aboard a US Liberty ship, the John Harvey, lost at Bari, Italy, during WWII); depleted uranium in Iraq and Afghanistan, amongst others; and the political disruptions of national borders drawn either ignorant of or to deliberately exploit local rivalries across the Middle East (Sykes-Picot), Africa, and the Indian subcontinent.
Even barring that, and allowing that there are long-term employment conditions (shipping, remote development, expeditions) which might be difficult to quit on a moment's notice, military service at the least has legal proscriptions on arbitrary quitting not found in civilian service.