Rifle volleys are no longer a requirement at military funerals, but are still allowed if the personnel is available.
Don't Be Alarmed by Gunshots Sunday, They're for a Military
Officers' names added to Akron police memorial
How Did the 21-Gun Salute Come to Be?
21-gun salute to honor Civil War soldiers nixed over local Pa
Funeral Etiquette: Military Funerals
Three-volley salute - Wikipedia
Firing Three Volleys at a Military Funeral - Taps Bugler: Jari
Artillery Cannon - Last Salute
Semper Fi Two
Do you know proper military funeral etiquette? > 193rd Special Operations Wing > Display
Why A 21 Gun Salute? - Wideners Shooting, Hunting & Gun Blog
Mandela funeral: 21-gun salute is proudest moment for captain, Nelson Mandela