PHILADELPHIA  FACT-OID from WIKIPEDIA:  "Through the 1960s to the 2000s Treasure Island, San Francisco and The Naval Damage Control Training Center, located in Philadelphia, Pennsylvania were home to the Navy's damage control schools as well as the nuclear, biological, radiological and chemical warfare school, both primary schools of new hull maintenance technicians. Treasure Island continued to train new sailors in the art of damage control until the base was decommissioned in 1996. As of 2015, the damage control school is at Naval Station Great Lakes, and is on the same base as basic engineering common core and other A schools.

From 1972 to 1988 HTs assumed all the duties and responsibilities of the Damage Controlman rating. Even though the names merged into just HT, the responsibilities to the Navy did not lessen. HTs now had to go to their primary A school in Philadelphia to learn the HT side, and then onto Treasure Island to learn the damage control and nuclear, biological, radiological and chemical side, then onto San Diego to learn welding, brazing and sheet metal work.^[1] By 1988 the Navy realized that damage control is such a large responsibility, they needed a rating specifically tasked with its duties, hence the reemergence of the Damage Controlman in 1988."