Generals and politics

Stupid propoganda already claims that generals are not involved in politics, they need to respect those generals in fields. is that true? I guess the 2nd part might be true, at least respect tohse soldiers. But those generals definitely are not politics free, remember vietnam and korean war? Today a general is talking about there's no surge in northern iraq, and comparing to things in past 6 month blah blah, tell me that's NOT politics. They are assigned by the president, right? Tell me they dont care about THEIR careers in a straight face.