7-10-1917 Harry B FLOUNDERS m. Mary MONKS, El Paso TX
familysearch.org Mary FLOUNDERS, married b. 10-5-1894 Leigh, Lancashire, England d. 3-8-1923 Bath, Greene Co OH; bur El Paso TX; resided Wilbur Wright Field. Parents: Harold W MONKS b Scot/Ellen WILKINS b Eng Inf: Harry B FLOUNDERS
Mary is on findagrave, but not Harry
IL Deaths male FLOUNDERS b/d 1933, Chicago, Cook Co I; bur Oak Forest Cem. F: Harry B FLOUNDERS b Media PA M: Helen CRONIN b Chicago
So, he was still living 1933....didn't find him 1920/30...considering where Mary lived he was possibly still in the military.He was disch 1914 in El Paso, but may have re-enlisted.
I have no idea if this is same person.... 7-14-1941 Helen FLOUNDERS m. Robert SCHULTZ, Chicago, Cook IL