Museum of Science and Industry (Chicago) of Progress event. For years, visitors entered the museum through its original main entrance, but that entrance became no longer large enough to handle an increasing volume of visitors. The newer main entrance is a structure detached from the main museum building, through which visitors descend into an underground area and re-ascend into the main building, similar to the Louvre Pyramid. In 1983, due to increased attendance, the museum started construction of its underground parking lot, located in three underground levels below the front lawn. Construction of the underground parking lot was finished in the 1990s. For over 55 years,
Structure of the British Armed Forces in 1989 Structure of the British Armed Forces in 1989 At the end of the Cold War in 1989 the British Armed Forces structure was as follows: In 1989 the British Armed Forces had a peacetime strength of 311,600 men and defense expenditures were 4.09% of GDP. Joint establishments were tri-service units providing services to all three branches of the British Armed Forces/ The Defence Operations Executive, led by the Deputy Chief of the Defence Staff (Commitments) and including the Assistant Chiefs of the Naval, General, and Air Staffs, supervised the Joint Operations Centre which in turn passed orders to the forces