Just played side op 150. This is a loving garbage mission and almost a game ruiner. I can't even beat it with the Lil' Chick hat, the enemies seem to be able to see me even if I haven't shot anyone or fultoned anything or CQC'd anyone around that area
And of course they don't tell you AT ALL to prepare for it, and there's NO WAY TO EXIT TO ACC once the second half begins, unless you get on the storage container and fulton it (clearly an oversight by them I think)
forget this mission. This is honestly the least Metal Gear thing I've been made to do in this game.