Built by: Electric Boat
Design: EB 224A
Keel laid: 20 June 1938
Launched: 25 May 1939
Sponsor: Mrs. Claude E. Bloch
Commissioned: 27 November 1939
First Skipper: Lt. Julian K. Morrison, Jr.

WAR PATROLS of USS Sealion
WP#	FROM	TO	DURATION	SINKINGS
1	CV Transit	SJ	uncertain	None
2	SJ S. China S.	SJ	45 days	see note A
3	SJ Transit	FA	11 days	None
4	FA Luzon	FA	29 days	None
5	FA S. China S.	FA	52 days	see note B
6	FA S. China S.	FA	55 days	see note C
7	BA Solomons	PH	45 days	see note D
8	PH Truk	MI	43 days	None
9	PH Marshalls	PH	43 days	None
10	PH Marshalls	PH	42 days	None
11	PH Carolines	PH	53 days	None
12	PH Empire	PH	55 days	see note E
13	PH Empire	MI	76 days	see note F