MET (Military Effects Test) shot was dropped from a 400 foot tower April 15, 1955. The primary purpose was to evaluate the destructive effects of nuclear explosions for military purposes. Operation Teapot was a series of 14 nuclear test explosions conducted at the Nevada Test Site in the first half of 1955. The aims of the operation were to establish military tactics for ground forces on a nuclear battlefield and to improve the nuclear weapons used for strategic delivery. As a group these devices combined several innovations, some previously tested, some introduced during this test series, to create a new pattern of fission device that would dominate the design of all later weapons. These devices used new compact, efficient, light weight spherical implosion systems; beryllium tampers; hollow cores; deuterium-tritium boosting; and the use of neutron pulse tubes as initiators to create light, compact, efficient, and reliable fission explosive systems.