CIMSEC – Shore-based team trainers – attack centers – are critical for submarine crews preparing for deployment to exercise the full range of tactical skills in a challenging training environment. These trainers focus on modeling complex ocean environments, sensors, and warships, resulting in a high-cost trainer with only two to three attack centers at each shore facility. The limited number of trainers coupled with high demand means that submarine crews in shipyard availabilities are low priority for these trainers, often going weeks between opportunities to use them. If the Navy wants a more lethal submarine force, it requires more low-cost training options for Pre-Commissioning Units and those in long shipyard overhaul.