The following Knapp's were killed in the Viet Nam War:

• Private First Class David Bruce Knapp US Army from Rochester NY b 10/8/49 kia 5/8/1968
• Lieutenant Junior Grade US Navy Fredric Woodrow Knapp from Huntington NY b 7/29/1943 kia 11/2/1967
• Colonel Herman Ludwig Knapp US Air Force from Roselle NJ b 4/11/1929 kia 4/24/1967
• Private First Class Kenton Don Knapp from Los Angles CA b 7/1/1943 kia 1/17/1967 
• Staff Sergeant Martin C Knapp US Army from Wheeling W VA.  b 3/10/1932 kia 11/17/1965
• Lance Corporal Richard Knapp US Marines Port Lavaca TX  b 5/21/46  kia 6/7/1967
• Staff Sergeant Richard Charles Knapp US Army from Warren OH b 5/6/1947 kia 1/29/1970
• Staff Sergeant Tommy Duane Knapp US Army from Des Moines IA b12/25/46 kia 4/4/1968

kia - killed in action