 An ARG is composed of an amphibious assault ship (LHA/LHD), an amphibious transport dock (LPD), a dock landing ship (LSD), and a Marine Expeditionary Unit (MEU), which includes a Marine Infantry battalion landing team, AV-8B Harrier II aircraft, CH-53 Sea Stallion, CH-46 Sea Knight, AH-1 Sea Cobra, and UH-1 Huey helicopters.The Navy had two to three ARGs deployed at a given time.Normally one of the ARGs was in the Mediterranean Sea and Persian Gulf or Indian Ocean area, and the other two were in the western Pacific Ocean.