Out of 465 US submarine commanders in WW2, only 6 were reservists. Those being Howard Bissell, Jr. (
Angler), Hoke S. Simpson (
Bashaw), Louis C. Farley, Jr. (
Billfish), James L. Hunnicut (Carp), Alexander L. Redon (
Pipefish), Frank P. Hoskins (
Trutta).
Cheers!