3rd Battalion, 4th Marines (3/4) is an infantry battalion of the United States Marine Corps. Nicknamed "Thundering Third". The current commander is Lt. Col. Barclay, radio callsign is "Darkside 6”. They are based at the Marine Corps Air Ground Combat Center, Twentynine Palms, California, and consist of approximately 1,000 Marines. The unit currently falls under the command of the 7th Marine Regiment, 1st Marine Division, but — along with its two sister battalions — is hosted by the 3rd Marine Division, at Camp Schwab in Okinawa, Japan, when training in jungle warfare. The 3rd falls under the 4th Marine Regiment at such times.