Hello, Jeff,
Please see additional details in my email message to you of this date.
David Colson Duane died 10/8/1921, most likely in Petersburg, VA. Cause of death: Acute Nephritis.
Buried in Blandford Cemetery, Petersburg, VA on 10/9/1921. Father's name: Timothy Duane. Birthplace: Dinwiddie County, VA.

I could not find any information confirming military service for David Marshall Duane.
MR