LPH is the US Navy hull 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.