The poor, poor military
Via Dr. Sanity, I found this data, which show that military recruits in recent years do not in fact appear to be drawn disproportionately from among the poor, thus negating a favorite liberal/left talking point.
Not that this will stop anyone from making the claim. And even if it does, and if the "poverty-striken victims" notion of the military is excluded, that would still leave its useful alternate: "bloodthirsty monsters" (see this for a discussion of both attitudes).