Tabanus: Difficult because of name spellings, and he may have been a seaman not showing in the records. Here's all I have (main suspect):1902: Egil Opsahl, b. 4 Jun 1902, d. June 1984 in Atlanta, Fulton, Georgia (US Social Security Death Index)
1910: Egil Henriksen (as no. 6 of 11 children), born 04.06.1902, son of farmer Henrik H. Opsahl (Elverum Norway, Census 1910)
1923: Egil Opdahl, 4/6 02, leaves Hamburg Germany 11 July 1923 for Oslo together with sister Esther (Hamburg passenger list)
1927: Egil Opsahl, 25, Engineer, born in Elverum Norway, arrives from Oslo to New York 22 Sep 1927 (NY passenger list) (outward Oslo list has electrical engineer)
1933: “An interesting chess match took place April 15 at Jackson, Mich., between Detroit and Michigan Chess Association … R. Ballenger 0 Eigo Opsahl 1” (Plain Dealer, 23 April 1933, p. 13) (possibly “Eizo”)
1933: Opsahl, E. (MI) in US Open, Detroit, Sept. 1933 (from Phony Benoni)
1938: Egil Opsahl, 36, naturalized 19 July 1937, address 19398 Charleston Str., Detroit, arrives from Oslo to New York 13 Oct 1938 (NY Passenger list)
1942: Egil Opsahl b. 4 June 1902, enlisted in US Navy 27 Oct 1942, released 9 July 1945 (US Dept Veteran Affairs Death File)
1984: Egil J Opsahl, d. 29 June 1984 in Fulton, Georgia (Georgia Death Index)