The gendarme helped bring an end to a gunman's shooting spree that killed three in southern France.
The gunman - 25-year-old Redouane Lakdim - said he had been acting on behalf of the Islamic State group.
He was shot dead by French police after mounting three separate attacks.
Lakdim is said to have been demanding the release of Salah Abdeslam, the most important surviving suspect in the 13 November 2015 Islamic State attacks in Paris, which killed 130 people.
One person - believed to be Lakdim's partner - has been arrested in connection with the shootings.