What does "AST" stand for in the context of military ranks?

In the context of military ranks, "AST" stands for Aviation Survival Technician. This role is integral within the Coast Guard, where personnel are trained in essential survival skills, rescue operations, and emergency medical techniques. Aviation Survival Technicians are responsible for the safety of aircrew and passengers during flight missions and are often involved in search and rescue operations. Their training includes skills in swimming, survival in various environments, and the use of specialized equipment, making them invaluable members of the aviation community in the Coast Guard.

The other options do not accurately capture the specific responsibilities or designation associated with the "AST" rank in the military, as Aviation Support Technician, Aviation Safety Technician, and Aerospace Support Technician refer to different roles that do not encompass the survival training and rescue operations pointed to by the term "Ast" as it applies specifically to the Coast Guard.