Tyler (S.H.I.E.L.D.)

"Uh...you're not authorized to be here." "Son, just don't."

- Agent Tyler and Captain America

Agent Tyler was at one point a mechanic on the S.H.I.E.L.D. Helicarrier. At some point between the Battle of New York and the attempted rescue of Franklin Hall, Tyler was presumably promoted to field agent. Agent Tyler was responsible for the transfer of gravitonium to "The Fridge," and the subsequent removal of the identification placard.

Before the Battle of New York
Tyler worked for S.H.I.E.L.D as a mechanic during the events before the Battle of New York.

While performing maintenance on a quinjet, he was approached by Captain America, Black Widow, and Hawkeye. Tyler initially told the trio that they were not authorized to use the quinjet, to which Captain America replied "Son, just don't." It is unknown if Tyler put up any further resistance before the quinjet was commandered.

After the Battle of New York
 At some point after the Battle of New York, Tyler presumably passed his field tests and became a field agent. After the attempted rescue of Dr. Franklin Hall from Ian Quin's compound in Malta, Phil Coulson instructed Tyler to take the gravitonium from Quinn's compound and store it in the Fridge. Coulson further instructed Tyler to remove the identification placard from the storage entrance, due to Franklin Hall's concern that the gravitonium was too dangerous and might fall into the wrong hands.

Trivia

 * Josh Cowdery is the "crossover" actor with the fewest lines in the Marvel Cinematic Universe, having uttered less than twenty total words.
 * In The Avengers, Cowdery is credited as "Maintenance Guy."