Zachary

Zachary was a high-ranking peace officer within the Denver Police Department, as well as a cyborg commander of World Marshal Inc.

Early life
At some point during the late 2000s, early 2010s, Zachary ended up experimented on by the Patriots, resulting in him becoming a cyborg. His left arm, in particular, was replaced with a prosthetic, containing data from the Patriots.

After the Patriots' fall, he ended up joining the Denver Police Department, acting as a peace officer since at least World Marshal Inc. took control of the privatized police department thanks to small-government legislation passed by then-state senator Steven Armstrong.

Desperado Incursions
In 2018, Zachary led a contingent of nine DPD cyborg cops to secure the area and prevent Raiden's arrival at World Marshal Inc.'s HQ building, two of which secured the outer perimeter of the barrier, while he himself led five cyborg cops within the barrier. After surrounding Raiden, Zachary then informed him that Raiden was forbidden from being within Denver, and thus was in violation of both state and federal law. When Raiden suggests that he'd better arrest him, Zachary and the other cops proceeded to chuckle at Raiden's suggestion, before citing that he and the other cops are authorized to utilize lethal force on Raiden due to his "threatening" a peace officer. However, despite this, Raiden managed to wipe him and his entire unit out, also taking Zachary's left arm in the process.

Behind the scenes
Zach is a character in Metal Gear Rising: Revengeance, as well as one of thirty cyborgs to contain retrievable left arms in the game. He acted as the first cyborg commander in Chapter R-03, in fact, being the first cyborg to attack Raiden in the chapter, and was also present in the immediate prior cutscene.