The LPDs were intended to provide both a heavy lift for amphibious operations and to support a one star (Brigade) Headquarters afloat. As originally designed they could carry a load of 15 Main Battle Tanks (MBTs), 5 Self Propelled Guns, 8 recovery and engineer vehicles, 6 x 3 Ton trucks with trailers and 28 Landrovers and trailers, in essence an Armoured Battle Group, or any equivalent load. Accommodation was also provided for up to 450 troops. The ships were equipped with an extensive array of communications equipment and an Amphibious Operations Room (AOR)linked to the Main Communications Office (MCO) and adjacent to the ships own Operations Room on 03 deck. The AOR was used by the Brigade Headquarters until it moved ashore. In addition to HQ 3 Commando Brigade, it could also be used by the army Brigade designated for amphibious operations. In the early 1970s this was Headquarters 24 (Airportable) Brigade based at Plymouth.