In the manga these were GM type C's (like the one Io borrowed for that awesome aerial battle) with the sled equipment. I think them being Dahle's makes more sense since the Dahle is more associated with the faction.... but damn did that GM look cool. :D
Even though they got the normal grunt dies treatment, I do like seeing that they are fairly good machines and if i’m the right hands could be an amazing grunt suit.
"Right, this chase has gone on long enough. Let's give these shitheads a wake-up call." -One Acguy pilot to the other before deploying the floating mines