I had a half-brother from an older generation who traveled from the US to Canada so he could enlist in an army that was actually fighting fascism while the US was playing isolationism nonsense. He and other Americans enlisted in that army, saw mountains of commando action, most definitely suffered from PTSD (getting buried for a few days under a bombed building could do that), and who would undoubtedly be royally and justifiably both hugely angry and wildly disappointed at Old Senescent's behavior toward longtime allies.