This is toy soldier set "Patrol Briefing" by King & Country. These are Australian troops in Vietnam.

This 3-figure set focuses on three kneeling and crouching Australian soldiers about to take part in a sweep around the base area outside of Nui Dat which was the headquarters of the 1st Australian Task Force in South Vietnam during the War.
As the platoon sergeant goes over the map in front of him the two 'diggers' listen carefully to his instructions.
As can be seen both the sergeant and one of the riflemen are carrying the standard L1A1 Self Loading Rifles while the third soldier rests his M60 Machine Gun on its bipod legs on the ground.
In addition, one of the kneeling riflemen is also carrying an M79 Grenade Launcher. Each set also includes 3 x copies of the map.