1915-1923refIn 1944, He, Miller and Sullivan were "...not even out of our twenties" capping age at 29 and having served enough to be promoted twice by the close of 1941/early '42 after being a minimum of 18 to serve, suggesting an absolute minimum of 19-20 in 1941 at Makin and 21-23 in 1944 at Peleliu, most likely mid-late twenties throughout the campaign.</ref>
Roebuck is part of the invasion force that assaults Makin Island. He comes to rescue Miller on Makin, stabbing the would be killer in the back. Along with Sullivan and the other Marine Raiders, they raid the island, rescue their support squad and escape Makin Island. Two years later, Roebuck, Miller, Sullivan and a new recruit named Pvt. Polonsky participate in the invasion of Peleliu as part of the 1st Marine Division. They make way for Allied forces after clearing Japanese defenses but Sgt. Sullivan gets stabbed by a Banzai Charger at the end of the level. Roebuck is promoted to Sergeant during the landing on Peleliu and takes command of the squad. He takes part in capturing Peleliu airfield and crushing the remaining Japanese forces there. After Peleliu, he leads Miller, Polonsky and several others in the invasion of Okinawa. After clearing Wana ridge, they receive orders to storm Shuri Castle. After fighting through numerous Japanese soldiers they storm Shuri Castle and come across Japanese forces attempting to surrender. He and Polonsky move in to secure the soldiers that pretended to surround, only to get attacked by them. He could live or die according to the player's actions.
Call of Duty: Black Ops
When walking through the Pentagon as Alex Mason, a portrait of Roebuck can be seen. His picture and pictures of World War II battles can also be seen in "Five".
Towards the end of the "Breaking Point", a group of three Japanese soldiers can be seen pretending to surrender. Roebuck and Polonsky both walk up to them and turn towards Miller, giving the Japanese a chance to strike. Roebuck, who is in between two soldiers calls for help and so does Polonsky. It requires a faster trigger finger and better aim to save Roebuck as he has two enemies holding him instead of one. If Miller saves Roebuck, he sacrifices Polonsky. If saved, Roebuck would kneel by Polonsky pleading him to get up and would shout, swear and curse at the attacking Japanese while firing his M1 Thompson. After the Japanese are defeated, he gives Miller Polonsky's dog tags and repeats what he said in the last line of the introduction of the mission. The same thing can happen to Roebuck also the enemys will drop a grenade and kill him.
Guardian Angel (10 / Bronze Trophy 15px) - In the final battle for Okinawa, save Sgt. Roebuck. (Solo or co-op)
Roebuck in action
Polonsky and Roebuck in a crater
Roebuck in Peleliu
Corporal Roebuck during the rescue mission to find Private Miller
Sgt. Roebuck's portrait
Sgt. Roebuck and Polonsky as seen in Call of Duty: World at War: Final Fronts.
Also in Call of Duty: World at War: Final Fronts, it can be noticed that Roebuck looks similar to Sgt. Dixon from Call of Duty 3.
Roebuck is unlocked as a Gamer picture when the player prestiges.
It seems Roebuck and Sgt Sullivan's friendship and actions may have been based on Dixon and McCullin's from Call of Duty 3. McCullin and Sullivan both die making their corporal (Dixon and Roebuck) sergeant. These two then die at the end of the American campaign (Roebuck dying is up to the player)
Roebuck's facial appearance seems to have a resemblance to John "Soap" MacTavish's, they both have a mohawk, scars and a similar head structure.