Anti-war
Anti-war advocacy is generally motivated by pacifism or partisanship. In the latter case, confusion can easily arise as the term anti-war would seem to connote the former. Since World War II, the anti-war movement in America has been almost exclusively partisan, saying that the United States was supporting the wrong side or was itself the aggressor.
Thus the term anti-war is often used specifically to indicate political opposition to America's war aims, notably during the Vietnam War and the invasion of Iraq. While reminiscent of pacificism, the "anti-war" movement is not opposed to war per se, but only America's involvement in it.
Often overlooked by anti-war activists is that the American military is volunteer today, and service is not compulsory.
So-called "anti-war activists" are content to let foreign governments invade other countries and slaughter or enslave innocent people, as long as the United States isn't involved.