Declassify Mission: Use Boomshields and Sawed-offs only
Kick the door open and wait for the locusts to charge to your position. Sawed-off shotguns are devastatingly powerful at close range. Wait until all the charging locusts are taken care of before moving in to take out the remaining enemies.
Once the main entrance is cleared, go downstairs and head to the right. You should find a COG tag skull painted near an opened doorway. Enter it and find the COG tag on the floor to your immediate right.
Head to the exit to complete the mission.