Mick Murray is an Amestrian State Military Officer stationed at Fort Briggs under the command of Major General Armstrong.
Mick first appeared under the command of Major Miles in Baschool, with the mission to capture Scar. When Miles was organizing search parties, Edward Elric sat with a dummy he made to resemble Alphonse Elric's armor, with Mick inside, pretending to be Al. Later, he received orders to assassinate Solf J. Kimblee, who managed to escape.
Months passed, and Mick, along with Liam Roach, was tasked with ensuring Winry Rockbell's safe return home. During the Promised Day, Mick and Liam stayed at Rockbell Automail to protect Pinako and Winry Rockbell, but they were powerless against the Nationwide Transmutation Circle.
(Source: Fullmetal Alchemist Wiki)
