le does not want to simply prop up an iraqi government that has done nothing to unite its bitterly divided people. then there is the u.s. embassy, the chaos today bringing back memories of iran, 1979, the u.s. embassy siege and of course benghazi. it is why u.s. diplomatic security agents train like this. a mock attack on a consulate which we recently witnessed. >> they're taking increased idf fire there and zeroing us in. copy. >> reporter: a simulated scramble to hold off the attackers. >> stay away from the windows. >> reporter: a battle. >> permission to evac. >> reporter: that america hopes it will not have to wage to protect the embassy here in baghdad. preparations for the possible evacuation of the embassy here have been intense. the big fear is that baghdad international airport might be overtaken. if that happens, osprey aircraft