The Fire Control Technician (FT) is responsible for all operational and administrative aspects of the submarines computer and control mechanisms used in weapons systems and related programs. You cannot enlist with a guarantee for this rating. You enlist in either AEF (Advanced Electronics Field) or SECF (Submarine Electronics and Computer Field). You are then assigned to be trained as an ETR (Electronics Technician Radio), ETNAV (Electronics Technician Navigation), FT (Fire Control Technician), or ST or STS (Sonar Technician or Sonar Technician Submarine, respectively). You may get your rating assigned randomly, by need.