Down Periscope (1996)

Synopsis
Vulgar, slapstick comedy abounds in this feature film debut for television sitcom star Kelsey Grammer. Almost everyone else thinks of Lieutenant Commander Tom Dodge is a class "A" goof who messes up every task he is assigned, but Adm. Dean Winslow thinks otherwise and decides to give Dodge one last chance by assigning him to helm an outmoded, diesel powered, rusty in a series of wargames. Dodge's sub is to be the enemy and must somehow outsmart their high tech opponents. Though ostensibly only games, Admiral Yancy Graham, who considers Dodge an embarrassment to the Navy, decides to do everything he can to scuttle Dodge and his ragtag crew's mission. ~ Sandra Brennan, All Movie Guide