Megan, until you get expert assistance, here are a couple of things that might be helpful to you.
I found them listed by serial number in the Natl Archives WWII enlistment database. To see that info yourself, go to this web page, click the "Search" button for "Electronic Army Serial Number Merged File, ca. 1938 - 1946 (Enlistment Records)" and do a search.
You may be able to get their personnel records through the NPRC in St. Louis. (They had a disastrous fire in 1973 which destroyed many records, but it is worth a try.) Info on that resource can be found at this web page: http://www.archives.gov/st-louis/military-personnel/index.htmlhttp://www.archives.gov/st-louis/military-personnel/index.html
I found this info listed in the VA gravesite locator:
KETELBOETER, MILO ELMER SSGTUS ARMY WORLD WAR II DATE OF BIRTH: 07/30/1911 DATE OF DEATH: 06/16/1970 BURIED AT: SECTION CSITE 1097 BLACK HILLS NATIONAL CEMETERY 20901 PLEASANT VALLEY DRIVE STURGIS, SD 57785 (605) 347-3830