 Thompson states that between September 1988 and January 1989 , Iowa 's crew did not conduct much training with the 16 @-@ inch guns , in part because of ongoing , serious maintenance issues with the main gun turrets . According to Ensign Dan Meyer , officer in charge of the ship 's Turret One , morale and operational readiness among the gun turret crews suffered greatly . In spite of the problems with the main gun turrets , the ship passed its Operation Propulsion Program Evaluation in October 1989 . 
