Do you know what city/state he was born? This record indicates birth in 1917 but doesn't indicate where. Also do you know where/when he married? A death record indicates an Ivan M Cain b. 1917 CO. This Ivan appears to be the son of (Al)bert B. Cain and Martha J Mayers.
United States, World War II Army Enlistment Records, 1938-1946
https://familysearch.org/pal:/MM9.1.1/K8B7-TFQ :
name: Ivan M Cain
Military Service 31 Mar 1941
place: Sacramento, California, United States
White citizen Single
birth 1917 birthplace
education: 2 yrs HS Semiskilled driver
rank: Private Branch Immaterial - Warrant Officers
California, Death Index, 1940-1997
https://familysearch.org/pal:/MM9.1.1/VP63-CGD
Ivan Meuton Cain
Death 05 Sep 1980 Sacramento, CA
birth date: 27 Jun 1917 Colorado
mother: Mayers
https://familysearch.org/pal:/MM9.1.1/VP8R-XF3
Martha Jane Cain
Death 19 Jun 1992 Placer, CA
birth date: 25 Mar 1898 Kansas
father: Mayers mother: Pendergrath
https://familysearch.org/pal:/MM9.1.1/VP42-PV6
Bert B Cain (Albert B Cain)
Death 09 Mar 1966 Yuba, CA
birth : 17 Jul 1891 CO
gender: Male
father: Cain mother: Disney
U S Census, 1920 Weld, CO
https://familysearch.org/pal:/MM9.1.1/MXLN-N8Q
self Bert B Cain M 28y CO
wife Martha J Cain F 22y KA
dau Elvira M Cain F 5y CO
son Ivan M Cain M 2y6m CO
dau Dorothy N Cain F 6m CO
U S Census, 1930 Fort Collins, Larimer, CO
https://familysearch.org/pal:/MM9.1.1/X74C-2H3
head Albert B Cain M 40 CO
wife Martha J Cain F 34 KS
dau Elvira M Cain F 15 CO
son Iran M Cain M 13 CO
dau Dorothy N Cain F 11 CO
dau Violet E Cain F 8 CO
dau Clara E Cain F 5 WY
dau Ernestine L Cain F 3 NE
son R Lee Cain M 1 NE
US Census, 1940 Yuba, Yuba Judicial Township, Sutter, CA
https://familysearch.org/pal:/MM9.1.1/K96X-PCS
head Bert Cain M 49 CO
wife Martha Cain F 42 KA
dau Dorthy Cain F 21 CO
dau Violet Cain F 18 CO
dau Clara Cain F 16 CO
dau Ernestine Cain F 14 CO
son R Lee Cain M 11 CO
dau Waunetta Cain F 8 CO
dau Lola D Cain F 6 CA
son William Cain M 3 CA
World War I Draft Registration Cards, 1917-1918
https://familysearch.org/pal:/MM9.1.1/KZKX-VZ1
Bert B Cain
Draft Registration June 5, 1917 Fremont County, CO
Male birth 17 Jul 1891 Fort Collins, CO