Ok you have to decide either to kill all the enemies or destroy the tank. I recommend killing the soldiers since the tank has a ton of "health". You start next to some crates, so use them to take cover. Start by taking out your M1C and sniping down all the enemy soldiers that walk alongside the tank. Try sniping them out even if they spot you.
Once they get too close quickly take out your M16A1. Press Select to select Auto Aim ON and point at the enemy soldiers that linger around. Once you’ve taken care of 2 waves of 4 soldiers a third wave comes out of the back of the tank. Like always, use the crates near you to take cover and avoid open areas at all cost.
Once you’ve taken care of the soldiers the commander appears on top of the tank (like shown above). Switch over to Manual Aim and aim for the commander’s head. You can actually shoot from behind the crates backing up a little so you can barely see the commander’s head on top. This is a good way to kill the commander and restrain yourself from taking a ton of damage. This is pretty much the battle.
Don’t forget that if you go for the tank you also have to kill all of the soldiers so that they won’t bother you.
Once you return to the MSF Mechs will now available for viewing and the Medical Team is created and Sickbay is now an option at the Staff menu. Also to end this OPS with a cherry, Amanda joins MSF . You can also develop *Tortilla Chips 1 which revives you once killed if you have these equipped. Nice.