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?

full_context: Document 1: Operation Fulcrum: The United States's Fulcrum nuclear test series was a group of 21 nuclear tests conducted in 1976-1977. These tests followed the "Operation Anvil (Nuclear test)" series and preceded the "Operation Cresset" series.
Document 2: Pahute Mesa: Pahute Mesa is one of four major nuclear test regions within the Nevada National Security Site (NNSS). It occupies 243 sqmi in the northwest corner of the NNSS in Nevada. The eastern section is known as Area 19 and the western section as Area 20.
Document 3: Pokhran-II: Pokhran-II was the series of five nuclear bomb test explosions conducted by India at the Indian Army's Pokhran Test Range in May 1998. It was the second Indian nuclear test; the first test, code-named "Smiling Buddha", was conducted in May 1974.
Document 4: Operation Teapot: 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.
Document 5: Operation Roller Coaster: Operation Roller Coaster was a series of 4 nuclear tests conducted by the United States in 1963 at the Nevada Test Site. These tests followed the "Operation Storax" series and preceded the "Operation Niblick" series.
Document 6: Trinity (nuclear test): Trinity was the code name of the first detonation of a nuclear weapon. It was conducted by the United States Army at 5:29 a.m. on July 16, 1945, as part of the Manhattan Project. The test was conducted in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico, on what was then the USAAF Alamogordo Bombing and Gunnery Range (now part of White Sands Missile Range). The only structures originally in the vicinity were the McDonald Ranch House and its ancillary buildings, which scientists used as a laboratory for testing bomb components. A base camp was constructed, and there were 425 people present on the weekend of the test.
Document 7: Nuclear weapons testing: Nuclear weapons tests are experiments carried out to determine the effectiveness, yield, and explosive capability of nuclear weapons. Throughout the twentieth century, most nations that developed nuclear weapons tested them. Testing nuclear weapons can yield information about how the weapons work, as well as how the weapons behave under various conditions and how personnel, structures, and equipment behave when subjected to nuclear explosions. Nuclear testing has often been used as an indicator of scientific and military strength, and many tests have been overtly political in their intention; most nuclear weapons states publicly declared their nuclear status by means of a nuclear test.
Document 8: Operation Dominic: Operation Dominic was a series of 31 nuclear test explosions with a 38.1 Mt total yield conducted in 1962 by the United States in the Pacific. This test series was scheduled quickly, in order to respond in kind to the Soviet resumption of testing after the tacit 1958–1961 test moratorium. Most of these shots were conducted with free-fall bombs dropped from B-52 bomber aircraft. Twenty of these shots were to test new weapons designs; six to test weapons effects; and several shots to confirm the reliability of existing weapons. The Thor missile was also used to lift warheads into near-space to conduct high-altitude nuclear explosion tests; these shots were collectively called Operation Fishbowl.
Document 9: Project 56 (nuclear test): Operation Project 56 was a series of 4 nuclear tests conducted by the United States in 1955-1956 at the Nevada Test Site. These tests followed the "Operation Wigwam" series and preceded the "Operation Redwing" series.
Document 10: Operation Wigwam: 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" .
Document 11: Operation Storax: Operation Storax was a series of 47 nuclear tests conducted by the United States in 1962-1963 at the Nevada Test Site. These tests followed the "Operation Fishbowl" series and preceded the "Operation Roller Coaster" series.
Document 12: Operation Niblick: The United States's Niblick nuclear test series was a group of 41 nuclear tests conducted in 1963–1964. These tests followed the "Operation Roller Coaster" series and preceded the "Operation Whetstone" series.
Document 13: Operation Whetstone: The United States's Whetstone nuclear test series was a group of 46 nuclear tests conducted in 1964-1965. These tests followed the "Operation Niblick" series and preceded the "Operation Flintlock (nuclear test)" series.
Document 14: Nevada Test Site: The Nevada National Security Site (N2S2),(though the abbreviation NNSS is still used), previously the Nevada Test Site (NTS), is a United States Department of Energy reservation located in southeastern Nye County, Nevada, about 65 miles (105 km) northwest of the city of Las Vegas. Formerly known as the Nevada Proving Grounds, the site was established on 11 January 1951 for the testing of nuclear devices, covering approximately 1,360 square miles (3,500 km) of desert and mountainous terrain. Nuclear weapons testing at the Nevada Test Site began with a 1-kiloton-of-TNT (4.2 TJ) bomb dropped on Frenchman Flat on 27 January 1951. Many of the iconic images of the nuclear era come from the NTS. NNSS is operated by National Security Technologies, LLC, a joint venture of Northrop Grumman, AECOM, CH2M Hill, and Babcock & Wilcox.
Document 15: Operation Greenhouse: Operation Greenhouse was the fifth American nuclear test series, the second conducted in 1951 and the first to test principles that would lead to developing thermonuclear weapons ("hydrogen bombs"). Conducted at the new Pacific Proving Ground, specifically on islands of the Enewetak Atoll, all of the devices were mounted in large steel towers, to simulate air bursts. This series of nuclear weapons tests was preceded by Operation Ranger and succeeded by Operation Buster-Jangle.
ground_truth: "Operation Castle"