BRP General Mariano Alvarez (PS-38) is the lead ship of its class of three coastal patrol ships currently in service with the Philippine Navy. She was the lead ship of the US Navy's Cyclone-class patrol ship prior to being transferred to the Philippine Navy.

The Cyclone-class patrol ships are a class of coastal patrol boats, formerly in service with the United States Navy. Most of these ships, named for weather phenomenae, were launched between 1992 and 1994. The primary mission of these ships is coastal patrol and interdiction surveillance, an important aspect of littoral operations outlined in the Navy's strategy, "Forward...From the Sea." These ships also provided full mission support for U.S. Navy SEALs and other special operations forces. Several ships of the class were transferred to the U.S. Coast Guard (USCG) for a time and then later returned.