perimeter control
11building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …
12Burglar alarm — Silent alarm redirects here. For the album, see Silent Alarm (album). Burglar (or intrusion), fire and safety alarms are all electronic today. Sensors are connected to a control unit via a low voltage hardwire or narrowband RF signal which is… …
13Ronald Reagan Washington National Airport — Washington National redirects here. For the baseball team, see Washington Nationals. Ronald Reagan Washington National Airport …
14Korean War — Part of the Cold War …
15Guadalcanal Campaign — Part of the Pacific Theater of World War II …
16Battle of Khe Sanh — For the song by Cold Chisel, see Khe Sanh (song). Battle of Khe Sanh Part of the Vietnam War …
17Collapse of the World Trade Center — Coordinates: 40°42′41.12″N 74°00′44.00″W / …
18List of Nike missile locations — Nike Missile family, From left, MIM 3 Nike Ajax, MIM 14 Nike Hercules, LIM 49 Nike Zeus. Map of all coordinates from Google …
19Battle of Ia Drang — Infobox Military Conflict conflict=Battle of Ia Drang partof=the Vietnam War caption=1/7 Cavalry at LZ X Ray date=November 14 ndash; November 18, 1965 place=coord|13|35|N|107|43|E|type:landmark|display=title,inline Ia Drang Valley, Vietnam casus …
20Roundabout — This article is about the road junction. For other uses, see Roundabout (disambiguation). Movement within a roundabout in a country where traffic drives on the right. Note the anticlockwise circulation …
