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. 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.