To answer someone's question, I thought I'd post the reply here, in case there are others who might be curious about NEST. In DOTM, Lennox states that "special forces" are trying to gain access to the city (Chicago). This was in reference to the Seals who swam up river. As it was explained to me by a technical expert on the films: "NEST guys are drawn from the special operations community, and NEST is an exclusive unit with it's own dedicated ground and air assets. It's operations take priority over any other operation currently being conducted by the United States and it's allies, and no, NEST is NOT an American unit. It is compromised of joint forces from NATO and allied countries who have signed the Alien-Autobot cooperation act." After reading the novelization to DOTM this made sense, as it and the game seem to indicate that the Autobots have begun to share their weapons knowledge with the humans. I think this is supposed to be alluded to in ROTF and DOTM in scenes where guys are carrying M249 squad automatic weapons that have what appear to be much larger barrels on them. Mech tech perhaps? who knows.