Hi Eric, according to every version of the Card rules I checked, the "Marked as Used" card cannot be played on a group. In a game tonight, I had a LMG + Rifle squad using Group Move when my opponent played it on my LMG. The game allowed it and it marked the whole group as spent.
I wasn't sure of the program should allow it but since the board game doesn't, I figured I'd post here to let you know.
I have no screen capture and it was in Classic AP mode multiplayer.
