Valdez

An ODST Marine in the UNSC, "Doc" Valdez was an enlisted Corpsman with the ODST detachment for the UNSC Pillar of Autumn in 2552.

Biography
When the Pillar of Autumn fled the Battle of Reach and found itself at Installation 04, Valdez persisted in his duties tending the wounded and dead even as the Covenant began to board the ship. As the fight progressed he, together with the remaining ODSTs, sought to defend the engine room where his medical skills were used to treat First Lieutenant Melissa McKay for a plasma burn on her arm.

Valdez' fate is unknown as is whether he died aboard ship or evacuated to the surface of the installation to be later killed along the way.

Trivia

 * Because medics in the UNSC Marine Corps are Navy Corpsmen, not technically Marines, Valdez may have in fact been a Petty Officer. If true, then being the senior Corpsman in his platoon, he might have been a Petty Officer Second Class, the equivalent of a sergeant.
 * His name may be in reference to the Red Vs. Blue character "Doc" Dufrane.