AR.....on a US Military Base.....when the National Anthem is played....or the Retreat Gun sounds and Retreat (Evening Colors) is played.....we stand to Attention, face the Flag.....or the Music....and if in Uniform.....Salute. All activity ceases....all vehicles pull to a stop....used to be all occupants exited the vehicle and rendered honors.
Playing golf is not the done thing as you found out it would appear.