Rocha's first assignment was as ops aboard the USS Mare Tranquillitatis, under the command of Captain Douglas Drexler. He was decorated twice for valor and given three outstanding evaluations from his previous COs; in addition, Rocha had received two 'superior' ratings in his performance evaluations and was once awarded the Omega Cluster (with pointed leaves).
On a deep-space assignment on a Federation outpost in the Triona system, Lt. Rocha was killed and absorbed by a coalescent organism. The organism then took his form and transferred to Relay Station 47 where it attempted to absorb Lt. Aquiel Uhnari. During its time at the relay station, it recorded a number of personal logs. (TNG: "Aquiel")