LPH is the US Navyhull classification symbol for helicopter landing platform amphibious ships of the Iwo Jima class. No ships of this class are currently in active service with the United States Navy:
USS Iwo Jima, LPH-2
USS Okinawa, LPH-3
USS Boxer, LPH-4 (Fomerly CV-21)
USS Guadalcanal, LPH-7
USS Guam, LPH-9
USS Tripoli, LPH-10
USS New Orleans, LPH-11
USS Inchon, LPH-12
Note that there have been other US Navy amphibious assault carriers named Iwo Jima, but they are entirely different vessels. The USS Iwo Jima in question is the only one of the LPH Iwo Jima class.
The new LPHs were not intended to compete with the larger aircraft carriers but rather they were designed particularly to combat load, transport, and land a Marine BLT of up to 2,000 personnel with an embarked Marine transport helicopter squadron.
Accordingly, the USS Boxer (CVS21) was reclassified as the LPH4 on 30 January 1959 and the USS Princeton (CVS37) reclassified as LPH 5 on 2 March.
An LPH had to have large living compartments for the combat troops and storage holds for their gear, and it also had to have elevators for bringing men and material easily and quickly to the flight deck for loading on the helicopters.
LPH can insure against the repair and replacement cost of a mechanical breakdown with a broad coverage, proven to be effective against a major operational risk.
LPH is particularly noted for advising, structuring and assisting the owners and management of start-up airlines.
LPH works with the operations and financial manager of a start-up operation, to tailor the most cost-effective programme, and to address the unforeseen and unpredictable exposures, which may strike and harm any new operation.