In addition to allowing for communication between Hal Emmerich and Solid Snake it can perform an electroshock attack using its manipulator, operate switches, knock on walls, and disarm traps. It is also equipped with stealth camouflage.
It can also serve to carry weapons and ammunitions, perform reconnaissance, and check the host's condition. Metal Gear Mk. II is also responsible for displaying maps and handling changes to OctoCamo.
Hal Emmerich's past is tainted with his involvement in developing Metal Gear REX, a weapon of mass destruction. He named this invention Metal Gear in an effort not to forget that onus. Metal Gear Mk. II, however, is exclusively a support machine.
After meeting up with Drebin, the Mk. II can be used as a network terminal to perform business transactions with him.
When Liquid Ocelot attempted his escape from Eastern Europe following the commencement of the Guns of the Patriots, the Mk. II followed him and leaped onto the patrol boat Liquid boarded. There, it managed to transmit photographs detailing a portion of Liquid's plan back to Otacon and Snake before Vamp discovered and disabled it permanently.