Funny.
I haven’t seen all that many anti-war people in political activism during my lifetime.
Certainly there were damned few of them in the United States during the sixties and seventies. Actual war protesters would protest against the diplomatic corps, Congress, the president, and the state department. The people who actually decide whether or not there will be a war.
People who protest at military bases are not in any way opposing the existence of war, they are merely opposing soldiers. It was like people angry at a law firm protesting the mailman for delivering legal notices.
No, except for being blinded by irrational mania, those people oppose, and always have opposed, being in Afghanistan and Syria. They got sold regime change in Kiev, Iraq, Libya, Egypt (etc) on false premises.