Hmm out of the 2 missions there one of them the Ace units is the Death Scythe Hell & Sandrock. The other is Zeta and ZZ Gundam I think it was. Forgot which numerical stages which was. But those should be the 2 different ace types that show up. The vid I had linked should show them appearing near the end as the third wave. Its pretty easy to rack up the ace points to get em to show up if you just go in there and melee the shit out of everything lol.
You can get a full parts set for both the deathscythe and sandrock fairly easy (asides from the weapons)
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
The deathscythes usually go into that stealth mode so you will seem them predatoring around the map lol. Ive done the mission like 20 times now and have not gotten any rare drops from them. D: Have not used my free luck booster yet, dont think I want to though. Those stages are seriously GREAT for money making and gaining exp. Should be able to lv up your MS parts a pretty good amount.
The next defense map is a bit harder since its more compact and as mentioned those mounted lasers are a pain in the ass if you leave em alone. Since it points right into Point A. Think that map only had 2 of them thankfully and no vehicles to worry about. That map in the colony, one of the rare drops which seems to be constant is for the MG Chain Mine, though I cant even build it yet as its not on my list lol. Im still puzzled by no shotgun drop at all. D:
WAT?!
Oh god it plays for everyone in MP?! D: Ok that is shitty...
Lets hope in a patch they address that, since do agree with you two that it seems rather pointless.