People's Bravery is a melee attack without using any weapon. You can find it mostly with the commander kits or as a Soviet on the map Stalingrad Red Square when you must find an weapon by taking a kit inside the mainbase or somewhere around the square inside or outside the houses. Believe me, you find enough weapons.
The People Bravery also hide in other kits? Some kits have people bravery, but they are not marked with an icon. Specialy Japanese kits like some Officier, Kamikaze and other kits.