Alternate Reality(split 2233)
Chapin was an operations division lieutenant assigned to the USS Enterprise in 2259 of an alternate reality.
He was on duty on the bridge during Kirk's and Khan's space jump from the Enterprise to the USS Vengeance. He monitored Kirk's flight route and informed Spock about debris in Kirk's flight path.
Chapin was present and standing behind Spock when the Vulcan contacted his prime reality counterpart. (Star Trek Into Darkness)