The Democrats have gotten really good at saying "We support the troops, but not the mission".
They hate the troop's mission so much, Murtha wants to undermine their training so they can't complete their mission. In Iraq, not completing your mission means getting blown up by an IED or ambushed on a convoy or hit with an RPG or mortar.
I'm sure though the Democrats will vote full funding for the funerals, after all, they support the troops even though they want to undermine their mission.
So while they support our troops but will sabatoge their mission, they don't support the terrorists, but they do support THEIR mission.