I don't see any mention of Charles Hubert Swope's birth date so not sure whether you had this already.
There is a baptism for him at the age of 5 .It notes his date of birth as 26 April 1902, which is same day and month but one year adrift from Charles Hubert Anderson's grave memorial.
Text reads : Charles Hubert Swope (parents names ) Elmer and Rose Swope, April 26 1902. baptised June 2 1907
Other children baptised on the same day were
Hilton Swope, b October 27 1906
Kathryn Nancy Swope b ( text originally says July 30, but overwritten and unclear, possibly Mar 20 or Nov 1898)
Helen Gladys Swope b July 30 1895.
Presbyterian Historical Society; Philadelphia, Pennsylvania; Accession Number: VAULT BX 9211 .W64452 F51 v.1 First Presbyterian Church, Merrill, Wisconsin, viewed on Ancestry.co.uk