in the play room i got the drum on the desk and the memory machine and put them in the beaker on the desk. The last drum is in a tent gaurded by tans. Whenever i try to shoot the tans gaurding it, they destroy the tent. How do Iget the drum? please help.

how did u get the chemics from that strange machine ?
to get the chemics under the medic tent u must talk with the grey spy and then take sarge in the grey dress to the landing field at the shoe and he kills the guards in the tent but how did u get the chemics from that wierd machine ???