American AcornsClarkson Groos
1908–1986 · Male · died at 78
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Overview
Service
World War II · Navy · 1942–1945 Confirmed
Navy service from March 1942 to November 1945 (VA death file); a Naval Reserve lieutenant commander in 1949, date of rank August 1, 1946 (Naval Reserve register). When he was first commissioned is not known. Very probably a brother of Gus Julius Groos Jr.
In the story: The twentieth century · Veterans of the family
Family
Parents
- Mother: Florence Alice Clarkson 1886–1964
Likely evidence: show why
Why: The 1920 census lists Florence Groos, 34, at San Antonio with her sons Clarkson 11, Frederick 8 and Gus 6. The father is not in that household; the brothers' surname, the name Frederick Carl Jr. and the register's grouping of the three point to Frederick Carl Groos. Likely rather than Confirmed until a birth record is read.
Records:
- 1920 U.S. census, San Antonio Ward 8, Bexar Co., Tex., Garden St., ED 97, sheet 15A: Florence Groos, 34, head; sons Clarkson 11, Frederick 8, Gus 6 (view at Ancestry.com)
- Register of Commissioned and Warrant Officers of the United States Naval Reserve, April 1949, p. 391: Groos, Gus J. Jr., LCDR (view at Internet Archive)
Review: assessed 10-20-2026; evidence: Index or transcription examined; Image examined.
- Father: Frederick Carl Groos
Likely evidence: show why
Why: The 1920 census lists Florence Groos, 34, at San Antonio with her sons Clarkson 11, Frederick 8 and Gus 6. The father is not in that household; the brothers' surname, the name Frederick Carl Jr. and the register's grouping of the three point to Frederick Carl Groos. Likely rather than Confirmed until a birth record is read.
Records:
- 1920 U.S. census, San Antonio Ward 8, Bexar Co., Tex., Garden St., ED 97, sheet 15A: Florence Groos, 34, head; sons Clarkson 11, Frederick 8, Gus 6 (view at Ancestry.com)
- Register of Commissioned and Warrant Officers of the United States Naval Reserve, April 1949, p. 391: Groos, Gus J. Jr., LCDR (view at Internet Archive)
Review: assessed 10-20-2026; evidence: Index or transcription examined; Image examined.
Life events
| Born | 13 Jun 1908, Texas, USA Confirmed evidence: show whyWhy: Birth date from the VA death file; born in Texas per the 1920 census. Records:
Review: assessed 10-20-2026; evidence: Index or transcription examined. |
|---|---|
| Died | 8 Jul 1986 Confirmed evidence: show whyWhy: VA BIRLS death file. Records:
Review: assessed 10-20-2026; evidence: Index or transcription examined. |
| Military service | U.S. Navy, 18 Mar 1942 to 1 Nov 1945 (VA death file); a Naval Reserve lieutenant commander, date of rank 1 Aug 1946, in the April 1949 register. When he was first commissioned is not known., 18 Mar 1942 Confirmed evidence: show whyWhy: The VA death file gives his Navy service dates. The April 1949 Naval Reserve register lists, on one page, GROOS CLARKSON (LCDR, born 1908, pay entry base date 18 Mar 1942), GROOS FREDERIC C JR (LT, born 1911, base date 29 Jul 1942) and GROOS GUS J JR (LCDR, born 1913). LCDR in the Naval Reserve register of 1949. Records:
Review: assessed 10-20-2026; evidence: Index or transcription examined; Image examined. |
Sources
Research sources
- 1920 U.S. census, San Antonio Ward 8, Bexar Co., Tex., Garden St., ED 97, sheet 15A: Florence Groos, 34, head; sons Clarkson 11, Frederick 8, Gus 6 Census view at Ancestry.com
- Register of Commissioned and Warrant Officers of the United States Naval Reserve, April 1949, p. 391: Groos, Gus J. Jr., LCDR Military view at Internet Archive
- U.S. Department of Veterans Affairs BIRLS Death File: Clarkson Groos, born 13 Jun 1908, died 8 Jul 1986; Navy, enlisted 18 Mar 1942, discharged 1 Nov 1945 Military view at Ancestry.com
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