David Charm was born on July 5, 1910 in Scranton, PA, the middle of three sons. His mother had been born in Germany; his father in Russia of Polish ancestry. His father was a laborer in Scranton, but by 1915 the family had moved to Staten Island where David's father opened a grocery store. David completed two years of high school and went to work at the store at some point; he was there in the 1940 census.
By the time he registered for the draft, on October 16, 1940, he was living with his family in Tompkinsville (a neighborhood of Staten Island) and working for Robert Levenstein in Secaucus, NJ (likely a relative of his mother's). He had also changed his first name to "Davis."
When he enlisted, on January 31, 1941, his occupation was listed in the category of "salesmen, to consumers." Davis was eventually assigned to the Signal Company Special as a supply clerk, and saw service in Europe with the unit during the war.
He was discharged from the Army on August 28, 1945 with the rank of T/5 and returned to Staten Island. On May 4, 1946 he married Rose Hulnick whose father was a delicatessen proprietor. The 1950 census lists Davis as proprietor of a delicatessen; Rose's father had died that year, so it's likely that Davis took over her father's business.
Little else is known of his life or work. Later in life he moved to Deerfield Beach, FL; there he married Harriet Greenfield on October 15, 1975.
He died on July 27, 1983 and is buried at Star of David Memorial Gardens in North Lauderdale, FL. His gravestone reads "beloved husband and brother," so it's likely he and Rose had no children.
Sources:
1910 birth certificate
https://www.ancestry.com/discoveryui-content/view/3002954:60484?tid=&pid=&queryId=9455c689f6f4fac5391276df7c9fe57a&_phsrc=AIM12&_phstart=successSource
1915 New York state census
https://www.ancestry.com/discoveryui-content/view/9099146:2703?tid=&pid=&queryId=73a003994400b3b8c64fb77fc0eb2216&_phsrc=AIM6&_phstart=successSource
1920 census
https://www.ancestry.com/discoveryui-content/view/54274142:6061?tid=&pid=&queryId=73a003994400b3b8c64fb77fc0eb2216&_phsrc=AIM9&_phstart=successSource
1925 New York state census
https://www.ancestry.com/discoveryui-content/view/15813551:2704?tid=&pid=&queryId=9455c689f6f4fac5391276df7c9fe57a&_phsrc=AIM14&_phstart=successSource
1930 census
https://www.ancestry.com/discoveryui-content/view/45693148:6224?tid=&pid=&queryId=9455c689f6f4fac5391276df7c9fe57a&_phsrc=AIM13&_phstart=successSource
1940 census
https://www.ancestry.com/discoveryui-content/view/4959111:2442?tid=&pid=&queryId=7df0766b930c8cf70f59804f1a3096ce&_phsrc=AIM1&_phstart=successSource
1940 future wife's census record
https://www.ancestry.com/imageviewer/collections/2442/images/m-t0627-02761-00921?pId=9458583
1940 draft card
https://www.ancestry.com/discoveryui-content/view/193804475:2238?tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&_phsrc=LXd5&_phstart=successSource
1941 enlistment record
https://www.ancestry.com/discoveryui-content/view/3956355:8939?tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&_phsrc=LXd4&_phstart=successSource
1945 article from the Staten Island Advance showing him being discharged from the Army
https://www.genealogybank.com/doc/newspapers/image/v2%3A143919AB216268A1%40GB3NEWS-1730903B89028335%402431699-172F76899355272A%408-172F76899355272A%40?h=6&fname=davis&lname=charm&fullname=&rgfromDate=1930&rgtoDate=1980&formDate=&formDateFlex=exact&dateType=range&kwinc=&kwexc=&sid=yuropcdqlaxjdfjntquyubaumehxrjhs_wma-gateway015_1674652266375
1946 marriage record (1st marriage)
https://www.ancestry.com/discoveryui-content/view/948077:61406?tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&_phsrc=LXd11&_phstart=successSource
1950 census
https://www.ancestry.com/discoveryui-content/view/286758351:62308?tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&_phsrc=LXd6&_phstart=successSource
1975 Florida marriage index (2nd marriage)
https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=8784&h=8797855&tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&usePUB=true&_phsrc=LXd13&_phstart=successSource&_gl=1*1m48wak*_ga*MTAyNTE2MjQyOS4xNjc0NjQ5Nzg0*_ga_4QT8FMEX30*MTY3NDY0OTc4Mi4xLjEuMTY3NDY1MTU1Mi44LjAuMA..*_ga_B2YGR3SSMB*YjJhMjg0ZDItNDA2My00YTFjLTk1ZTEtYzY3NzgyOTI2MmIzLjE0LjEuMTY3NDY1MTU1Mi45LjAuMA..
1983 VA death record
https://www.ancestry.com/discoveryui-content/view/8923750:2441?tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&_phsrc=LXd7&_phstart=successSource
1983 Florida death index
https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=7338&h=2440657&tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&usePUB=true&_phsrc=LXd8&_phstart=successSource&_gl=1*bmcqw8*_ga*MTAyNTE2MjQyOS4xNjc0NjQ5Nzg0*_ga_4QT8FMEX30*MTY3NDY0OTc4Mi4xLjEuMTY3NDY1MTI3NS41OS4wLjA.*_ga_B2YGR3SSMB*YjJhMjg0ZDItNDA2My00YTFjLTk1ZTEtYzY3NzgyOTI2MmIzLjE0LjEuMTY3NDY1MTI3Ni41OC4wLjA.
1983 Find a Grave record
https://www.findagrave.com/memorial/64514027/davis-charm?_gl=1*150u78z*_ga*MTAyNTE2MjQyOS4xNjc0NjQ5Nzg0*_ga_4QT8FMEX30*MTY3NDY0OTc4Mi4xLjEuMTY3NDY1MTMzNC42MC4wLjA.*_ga_B2YGR3SSMB*YjJhMjg0ZDItNDA2My00YTFjLTk1ZTEtYzY3NzgyOTI2MmIzLjE0LjEuMTY3NDY1MTMzNS41OS4wLjA.
1983 Social Security death index
https://search.ancestry.com/cgi-bin/sse.dll?indiv=1&dbid=3693&h=10402020&tid=&pid=&queryId=f09ac710039b8be167e45a0f0a8a473e&usePUB=true&_phsrc=LXd10&_phstart=successSource&_gl=1*1ex9wqu*_ga*MTAyNTE2MjQyOS4xNjc0NjQ5Nzg0*_ga_4QT8FMEX30*MTY3NDY0OTc4Mi4xLjEuMTY3NDY1MTQwNi41OC4wLjA.*_ga_B2YGR3SSMB*YjJhMjg0ZDItNDA2My00YTFjLTk1ZTEtYzY3NzgyOTI2MmIzLjE0LjEuMTY3NDY1MTQwNi41OC4wLjA.