Have you done it single handed then bro??
I have, it´s not really that hard when you just practice around and if neede just play tricky.
Like once in very hard I had to hide in the main building of the Oasis\Complex for like 10 minutes before trying to do something as I had to figure out some sort of ambush point.
And it´s not the mechanic you get. In previous mission (before the night standoff) there was a medic inside the main building if I am not 100% wrong.
Now go to the main building ( = the one where´s the radio to "start" the attack) and check the "main hall". You should see this medic there, talk to him and you have free soldier under your command if I am not 100% wrong again. Just remember to give him some sort of weapon, otherwise he gets killed rather easily.
It may take few tries, and it took hell of a tries back when I played it on very hard, so in other words it´s rather easy but tricky.