Original sentence: Regimental Combat Team 31 was too far from its parent Division for support and was decimated by the onslaught of the Chinese.The 3d Infantry Division was evacuated on 24 December 1950.The Marines managed to reach the temporary safety of Hungnam, where 3d and 7th Infantry Divisions and I ROK Corps provided perimeter defense.The Marines were on the west side of the Changjin reservoir and Regimental Combat Team 31 (RCT31 AKA Task Force Faith) of the Army's 7th Infantry Division on the east side
Edited sentence: Regimental Combat Team 31 (RCT31 AKA Task Force Faith) of the Army's 7th Infantry Division replaced the 5th Marine Regiment on the east side of the reservoir in a piecemeal fashion with only two of its maneuver battalions in place before heavy engagement with the enemy commenced.Regimental Combat Team 31 was too far from its parent Division for support and without organic tank support and its third maneuver element; it was decimated by the onslaught of the Chinese.The 3d Infantry Division was last to leave the beach and evacuated on 24 December 1950.The Marines managed to reach the safety of Hungnam first, where 3d and 7th Infantry Divisions and I ROK Corps provided perimeter defense.The Marines were on both left and right sides of the Changjin reservoir