Again, the standing army in the US is not considered "politically reliable" to effect forcible civilian disarmament. That will have to be done by some sort of a "special federal police force" (an extension of BATFE, perchance?). It is not a standing army that threatens liberty today - it is the expansion of police forces with a political agenda and the enactment of laws that criminalize the use, practice and possession of militarily suitable arms by the people that theatens liberty.

Don't forget that the members of the standing army that we have today is very aware of their responsibility to side with the people and against the government should the government turn bad. Disarming ANYBODY not disenfranchised from full citizenship is one of the most visible signs that it has gone wrong. So no, the US Government will have to rely upon law enforcement to disarm civilians, as the military is not "politically reliable" for that task.