| image=FileAbrams brush.jpg|250px
| name=M1A1 Abrams
| type=WikipediaTank classification battle tank (late twentieth century)|Main battle tank
| health= 300 (turret)
| weapons=*Cannon (60)
*Machine gun (10)
| entity=N/A (http//developer.valvesoftware.com/wiki/Brush brush) (the turret itself is named "func_breakable")
The '''M1A1 Abrams''' tank is an American heavy duty vehicle equipped with a large howitzer cannon, and a coaxial machine turret and is encountered numerously throughout the Black Mesa compound. The Abrams is used as the primary attack and defend vehicle by the Hazardous Environment Combat Unit|HECU during the Black Mesa Incident to combat against the invading Xen and Race X aliens.
In ''Half-Life'', the Abrams is first encountered in the chapter ''Surface Tension'', providing fire support for a group of entrenched HECU soldiers. Another is stationed near the end of the chapter ''"Forget About Freeman!"'', blocking the entrance to the Sector F Lambda Complex Mesa Central Complex|Black Mesa Central Complex. It differs from the first in a way that it also fires a machine gun. The tank is seen a third time near the end of the same chapter, this time with a mounted M2 Browning Machine Gun|M2 machine gun on top, and the hatch open. It is unmanned, allowing the player to fire the 120mm cannon and the M2 at the incoming Vortigaunts and Alien Grunts.
===''Half-Life Blue Shift''===
In ''Blue Shift'', a single Abrams is encountered in the Freight Yard, in the chapter ''Captive Freight''. It is placed on a train wagon, with a nearby M35 cargo truck|truck conveniently stocked with rockets. It is not encountered for the rest of the game.
*The Abrams is completely bulletproof; explosives or experimental weaponry (such as the Tau Cannon) will be needed to destroy one. Its body is also invulnerable to any of the player's weapons; only the turret will take damage. Since it keeps on firing at the player with its cannon and machine gun, the best approach is to take cover and shoot it with the HECU RPG|RPG or the Tau Cannon's secondary attack. It will take three missiles to the turret to take it down.
*If the Abrams catches Barney in the truck in ''Blue Shift'', it blows off its back, which can only be survived by crouching. This can be achieved with simple gunfire, unlike the Abrams tanks featured in ''Half-Life''.
*Surprisingly, the Abrams is vulnerable to the crowbar, and can be destroyed with a little over two dozen whacks to the turret. This is not a practical attack method however, as the tank's explosion upon destruction will kill the player.
FileAbrams2.jpg|The Abrams in ''Surface Tension''.
FileForget about Freeman abrams detroyed.jpg|A destroyed Abrams in Sector F in ''"Forget About Freeman!"''.
FileAbrams.jpg|An Abrams used by Freeman to destroy Alien Grunts in Sector F.
==List of appearances==
*''Half-Life Blue Shift''
*Merkava, the cut Conscripts|Conscript main battle tank
CategoryHECU VehiclesCategoryBrush entitiesCategoryTanks