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Amphibious Squadron 4 (PHIBRON) is responsible for planning and executing Amphibious Ready Group (ARG) operations and deployments in conjunction with a Marine Expeditionary Unit (MEU). PHIBRON 4 typically has tactical control of three amphibious ships, which have the capability to land troops and equipment by air and sea simultaneously, as well as support troops ashore with fixed and rotary-wing aircraft.

PHIBRON 4 supports embarked amphibious forces in performing expeditionary operations on remote shores in support of national policy. The squadron’s capabilities also include rendering humanitarian assistance and disaster relief, maintaining maritime security, rescuing distressed mariners and evacuating non-combatant Americans.
In fulfilling these vital missions, PHIBRON 4 continues to contribute to America’s policy of preserving peace and defending freedom worldwide by maintaining a ready peacetime presence in areas of vital interest to the security of the U. S. and our partners around the globe.
Commander, PHIBRON 4 presently oversees the Iwo Jima Amphibious Ready Group that teams with the embarked 26th Marine Expeditionary Unit to provide a flexible force capable of conducting amphibious operations in a wide-range of environments.
The Iwo Jima ARG is comprised of the amphibious assault ship USS Iwo Jima (LHD 7), the transport dock ship USS New York (LPD 21), the dock landing ship USS Oak Hill (LSD 51), Fleet Surgical Team (FST) 8, Helicopter Sea Combat Squadron (HSC) 28, Tactical Air Control Squadron (TACRON) 22, components of Naval Beach Group (NBG) 2 and the embarked staff of PHIBRON 4.