Question: What United States military fortification was founded in 1994?

<P0-S0> The Peaks Island Land Preserve (PILP) is a non-profit organization concerned with conserving natural land on Peaks Island, Maine for public use. <P0-S1>  As of 2013, the PILP managed over 140 acre of land. <P0-S2>  It was founded in 1994 to preserve Battery Steele, an historic United States military fortification built on Peaks Island during World War II. <P0-S3>  After acquiring Battery Steele, PILP began to obtain land through purchase and donation across the island. <P0-S4>  The PILP held its first post-incorporation meeting in 1995 at the Fifth Maine Regiment Community Center. <SEP> <P1-S0> 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. <P1-S1>  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. <P1-S2>  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. <SEP> <P2-S0> Fort Yamhill was an American military fortification in what became the state of Oregon. <P2-S1>  Built in 1856 in the Oregon Territory, it remained an active post until 1866. <P2-S2>  The Army outpost was used to provide a presence next to the Grand Ronde Agency Coastal Reservation. <P2-S3>  Several officers stationed at the United States Army post prior to the American Civil War would later serve as generals in that war. <SEP> <P3-S0> 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. <P3-S1>  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. <P3-S2>  It is named for Harry Lee Steele, who was a Coast Artillery officer during World War I. <P3-S3>  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. <P3-S4>  It was built to protect Casco Bay, particularly Portland harbor, from Kennebunk to Popham Beach in Phippsburg. <P3-S5>  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.” <P3-S6>  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. <P3-S7>  On October 20, 2005, the property was listed on the National Register of Historic Places. <P3-S8>  Other coast defense structures on the island include fire control towers and the counterweight for a disappearing searchlight tower (it "disappeared" when folded down).