Question: Operation Wigwam was conducted between two series of nuclear test explosions, one of which was aimed to establish military tactics for ground forces on a nuclear battlefield and was preceded by which operation?

Related documents: [0]  [DOC] Operation Wigwam involved a single test of the Mark 90 Betty nuclear bomb. It was conducted between "Operation Teapot" and "Project 56" on May 14, 1955, about 500 mi southwest of San Diego, California. 6,800 personnel aboard 30 ships were involved in "Wigwam". The purpose of "Wigwam" was to determine the vulnerability of submarines to deeply detonated nuclear weapons, and to evaluate the feasibility of using such weapons in a combat situation. ("See" Report of Commander) The task force commander, Admiral John Sylvester, was embarked on the task force flagship USS "Mount McKinley" . [END] 
[1]  [DOC] Operation Teapot was a series of fourteen nuclear test explosions conducted at the Nevada Test Site in the first half of 1955. It was preceded by "Operation Castle", and followed by "Operation Wigwam". "Wigwam" was, administratively, a part of "Teapot", but it is usually treated as a class of its own. 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. [END]  
Answer: "Operation Castle"
"Operation Castle"