i already had fully modded hk-21 when i got there. all my mercs were inside of shaman's place. put down raven overwatch with hk-21 using ammo piercing bullets. then took headshots with my other mercs (armed with gewehr and svd) for close ones. also got barry in my team since day 1 and his amazing shaped charges did the job. too easy. none of my mercs wounded in commando diff.
i got imp, fox, raven, barry, wolfie and livewire in my squad.