Military

Early in the game, military personnel are sent to silence the Carter Science Center and retrieve the data related to α-Projectand β-Project. They are seen to have documentation indicating targets to eliminate. The military intervention is led by COL Anderson, who, upon failing to stop the T'lan Invasion, commits suicide.

Military Units
The military personnel seen in BREAKDOWN predominantly consist of three groups.

The first group is US Navy wearing Woodland BDUs and tactical vests armed mainly with MP5s.

The second group is US Army Delta Force dressed in solid-black BDUs and tactical gear including cloth face-masks and armed with MP5s and modified SMAWs. The blue triangular patch on their left shoulder identifies them as Delta.

The third group is a USMC Special Operations unit led by 1LT Gianni De Luca. They wear Urban BDUs with Woodland Tactical Vests and are armed with state-of-the-art (fictional) Anti-T'lan Lasers. This group is unique in that they are not hostile, as 1LT De Luca uses his discretion to ignore the order to kill Derrick (and presumably all research staff). While much smaller than the other military units, they cross paths with Derrick on several occasions.

Vehicles
At least one Attack Helicopter is utilized in the silencing of the facility. Unlike other weapons and equipment which are currently in use by both US and Japan, this attack helicopter appears to be of Russian make (Night Hunter?). Either the joint-facility extends far beyond that of just the US and Japan (which is entirely possible), or Japan has purchased several of these helicopters in the fictional near-future of 2004. A Utility Helicopter (likely a decommissioned Sea King) is used for an attempted evacuation (carrying an estimated 15 scientists), though the military destroys it before it can take off.

Black Hawk Utility Helicopters are used quite extensively in the transport of personnel and equipment to and from both the facility and Site-Zero.

Several Jeeps also exist within Site-Zero. It's likely that these were present before military involvement at Terminus 4 (for research staff transportation). If this is the case, these Jeeps are likely vintage, Post-War (Korea?) Jeeps.