On February 18, 1944, the 22nd Marines under the command of Colonel John T. Walker, participated in the Battle of Eniwetok, in the northwest area of the Marshall Islands, capturing the islands of Engebi in 6 hours, Eniwetok Atoll on February 21 with the 1st and 3rd Battalions of the 106th Infantry Regiment of the 27th Infantry Division, and Parry on February 22. The 22nd Marine proceeded to take Kwajalein and Roi-Namur from March 7 to April 5. This was the first Marine Corps unit to formally employ fire team tactics in combat. On April 6, the Marine regiment was sent to Guadalcanal for rest, replacements, and further training.