Source Information:
Ancestry.com. U.S. WWII Draft Cards Young Men, 1940-1947 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2011.
Ancestry.com. U.S., World War II Army Enlistment Records, 1938-1946 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2005.
Ancestry.com. New York, Index to Petitions for Naturalization filed in New York City, 1792-1989 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2007.
https://www.ancestry.com/search/?name=johannes_svan&birth=1901&count=50