Question: What United States military fortification was founded in 1994?
Context: The Peaks Island Land Preserve (PILP) is a non-profit organization concerned with conserving natural land on Peaks Island, Maine for public use.  As of 2013, the PILP managed over 140 acre of land.  It was founded in 1994 to preserve Battery Steele, an historic United States military fortification built on Peaks Island during World War II.  After acquiring Battery Steele, PILP began to obtain land through purchase and donation across the island.  The PILP held its first post-incorporation meeting in 1995 at the Fifth Maine Regiment Community Center. Fort Sullivan (briefly Fort Sherbrooke) was a 19th-century military fortification in Eastport, Maine.  It lay opposite New Brunswick, Canada, and served as an important coastal defense for the easternmost United States of America during the 19th century.  As part of the establishment of New Ireland during the War of 1812, British Commodore Sir Thomas Hardy, 1st Baronet conquered the fort in 1814 and renamed it Fort Sherbrooke after John Coape Sherbrooke, the Governor of Nova Scotia. Fort Fillmore, located at 32°13′30″N 106°42′52″W, was a United States military fortification established by Colonel Edwin Vose Sumner in September 1851 near Mesilla in what is now New Mexico, primarily for the purpose of protecting settlers and traders traveling to California.  Early frontier migrants were under constant threat from attack by local Native Americans, and a network of forts was eventually created by the U.S. government to protect and encourage westward expansion.  Fort Fillmore was intended to protect a corridor plagued by hostile Apaches, where several migration routes converged between El Paso and Tucson to take advantage of Apache Pass. Alcatraz Island ( ) is located in San Francisco Bay, 1.25 mi offshore from San Francisco, California, United States.  The small island was developed with facilities for a lighthouse, a military fortification, a military prison (1868), and a federal prison from 1934 until 1963.  Beginning in November 1969, the island was occupied for more than 19 months by a group of Native Americans from San Francisco, who were part of a wave of Native activism across the nation, with public protests through the 1970s.  In 1972, Alcatraz became part of a national recreation area and received designation as a National Historic Landmark in 1986. Fort Yamhill was an American military fortification in what became the state of Oregon.  Built in 1856 in the Oregon Territory, it remained an active post until 1866.  The Army outpost was used to provide a presence next to the Grand Ronde Agency Coastal Reservation.  Several officers stationed at the United States Army post prior to the American Civil War would later serve as generals in that war. Battery Steele (U.S. Army Corps of Engineers Battery Construction #102) is a United States military fortification on Peaks Island, Portland, Maine in Casco Bay.  Completed in 1942 as part of World War II, it is located on 14 acre on the oceanside area of the island, formerly part of the Peaks Island Military Reservation.  It is named for Harry Lee Steele, who was a Coast Artillery officer during World War I.  It was armed with two 16-inch MkIIMI guns and, with a 12-inch gun battery at Fort Levett on Cushing Island, replaced all previous heavy guns in the Harbor Defenses of Portland.  It was built to protect Casco Bay, particularly Portland harbor, from Kennebunk to Popham Beach in Phippsburg.  According to Kim MacIsaac and historian Joel Eastman in "An Island at War", “Battery Steele is not only the largest gun battery built on Peaks Island, but also an example of the largest battery ever built anywhere in the United States.”  In 1995, after decades of non-use, the Peaks Island Land Preserve, a community land preservation group, formed to purchase the area and forever preserve it as a public space.  On October 20, 2005, the property was listed on the National Register of Historic Places.  Other coast defense structures on the island include fire control towers and the counterweight for a disappearing searchlight tower (it "disappeared" when folded down). Fort McGilvray was a United States military fortification located on Caines Head, a cliff 650 feet above Resurrection Bay south of Seward, Alaska.  The United States Army established a series of defensive positions along the coast of the bay during World War II to defend Seward against a possible Japanese invasion.  The bay was a strategically important location, as it remained ice-free throughout the year, and Seward served as the southern terminus of the Alaska Railroad, an important route for transporting civilian and military supplies throughout the territory. The Fort Vengeance Monument Site is an archaeological and commemorative site on United States Route 7 in northern Pittsford, Vermont.  The site includes the archaeological remains of one of Vermont's oldest documented homesteads, and the only surviving site of a state-ordered military fortification of the American Revolutionary War.  The site is marked by a stone memorial placed in 1873, and was listed on the National Register of Historic Places in 2006. The United States Military Academy Preparatory School (USMAPS), sometimes referred to as West Point Prep, is a preparatory school for the United States Military Academy (USMA).  Located in West Point, New York, its official mission is "to provide academic, military and physical instruction in a moral-ethical military environment to prepare and motivate candidates for success at the United States Military Academy." Fort Stark is a former military fortification in New Castle, New Hampshire, United States.  Located at Jerry's Point (also called Jaffrey's Point) on the southeastern tip of New Castle Island, most of the surviving fort was developed in the early 20th century, following the Spanish–American War, although there were several earlier fortifications on the site, portions of which survive.  The fort was named for John Stark, a New Hampshire officer who distinguished himself at the Battle of Bennington in the American Revolution.  The purpose of Fort Stark was to defend the harbor of nearby Portsmouth and the Portsmouth Naval Shipyard.  The fort remained in active use through the Second World War, after which it was used for reserve training by the US Navy.  The property was partially turned over to the state of New Hampshire in 1979, which established Fort Stark Historic Site, and the remainder of the property was turned over in 1983.  The grounds are open to the public during daylight hours.
Answer: Battery Steele