Corporal R. Ryan was a member of the MACO force assigned to Enterprise during its Delphic Expanse mission and afterwards. He was a sniper.
In September of 2153, Ryan accompanied Lieutenant Malcolm Reed and Major Hayes on a mission to the trellium mining planet to rescue Captain Jonathan Archer, Commander Tucker, and Kessick. Following a directive from Hayes, Ryan sniped the foreman of the planet's north mine, using the targeting scope on his particle rifle. (ENT: "The Xindi")
In an alternate timeline, Ryan, along with W. Woods and B. Moreno, fended off a Xindi-Reptilian boarding party, killing one of the invaders during the battle. (ENT: "Twilight")
Ryan and Corporal Chang guarded the entrance to a crash landed Xindi-Insectoid starship on which Captain Archer tried to hatch the vessel's youth. Both MACOs denied T'Pol access to the Xindi-Insectoid hatching chamber. (ENT: "Hatchery")
In 2154, when Enterprise was confronted with a "future version" of itself, Ryan guarded discussions between Captain Archer, Lorian, and Karyn Archer in the ship's conference room. (ENT: "E²")
Corporal Ryan and Private Woods accompanied Captain Archer and Lieutenant Reed on board Harrad-Sar's barge, where Harrad-Sar offered them drinks and food. Like every other male present, Ryan was hypnotized by the performance of three Orion slave girls – D'Nesh, Maras, and Navaar. (ENT: "Bound")
Ryan was played by regular background actor Jason Collins in almost all of his appearances, except his last three, where he was played by background actor Aaron White.
