program name, the "Fast Response Cutter"-class and is used for search and rescue work and law enforcement. icebreaking tug (WTGB): icebreakers used primarily for domestic icebreaking missions. Other missions include search and rescue, law enforcement, and aids to navigation maintenance. Patrol Boats (WPB): There are two classes of WPBs currently in service; the s and the s Small Harbor Tug (WYTL): small icebreaking tugboats, used primary for ice clearing in domestic harbors in addition to limited search and rescue and law enforcement roles. Boats The Coast Guard operates about 1,650 boats, defined as any vessel less than long, which generally operate near shore and on inland waterways. The Coast Guard boat fleet includes: Motor Lifeboat (MLB): The Coast Guard's primary heavy-weather boat used for search and rescue as well as law enforcement and homeland security. Response Boat – Medium (RB-M): A new multi-mission vessel intended to replace the utility boat. 170 planned Special Purpose Craft – Near Shore Lifeboat: Only 2 built. Shallow draft, lifeboat substituted for the Motor Life Boat, based at Chatham, Massachusetts Deployable Pursuit Boat (DPB): A launch capable of pursuing fast cocaine smuggling craft. Long Range Interceptor (LRI): A high-speed launch that can be launched from the stern ramps of the larger Deepwater cutters. Aids to Navigation Boats (TANB/BUSL/ANB/ANB): Various designs ranging from used to maintain aids to navigation. Special Purpose Craft – Law Enforcement (SPC-LE): Intended to operate in support of specialized law enforcement missions, utilizing three Mercury Marine engines. The SPC-LE is long and capable of speeds in excess of and operations more than from shore. Response Boat – Small (RB-S): A high-speed boat, for a variety of missions, including search and rescue, port security and law enforcement duties. Transportable Port Security Boat (TPSB): A well-armed boat used by Port Security Units for force protection. SPC-SW Special Purpose Craft, Shallow-water: Over-the-Horizon (OTH) boat: A rigid hull inflatable boat used by medium and high endurance cutters and specialized units. Short Range Prosecutor (SRP): A rigid hull inflatable boat that can be launched from a stern launching ramp on the National Security Cutters. Aircraft The Coast Guard operates approximately 201 fixed and rotary wing aircraft from 24 Coast Guard Air Stations throughout the contiguous United States, Alaska, Hawaii, and Puerto Rico. Most of these air stations are tenant activities at civilian airports, several of which are former Air Force Bases and Naval Air Stations, although several