Adam-I420

Adam-420 was a Spartan III Incognito who was trained as a medic, however, he did know enough about fighting to hold his own.

Adam-420 preferred to wear black and blue Centurion armor. He was also one of Jay-425's teammates until Adam was sent to Installation 03, while Jay stayed aboard the UNSC Spartan's Prayer.

420 often used an SMG in combat, preffering it over bigger, bulkier weapons.

Requiem
Adam had a very minor role on Requiem, being a field medic, however, he did manage to save a few Marines in the heat of battle.

Installation 02
Spartan-420 was sent to Installation 02 due to suspicion from ONI that the Promeatheans were planning to activate the Halo rings. Adam found that it was not the Promeatheans trying to activate the ring, but the Covenant's remains. Adam is currently on Installation 02, fending off Covenant forces.

Personality
Spartan-420 was often kind to his patients, and he was also very protective of them, even going to the lengths of reconsidering other options, if a harsh one came up, such as amputating limbs. Despite this, he would do whatever he could to make sure that they lived.