Claymore mine in the process of being 'Armed'.

The M18A1 was standardized in 1960 for the Vietnam War. Its primary use was in perimeter defences and ambushing. The M18A1 comprised of a curved rectangular cast-iron box with spikes fitted to the base. It has an olive coloured plastic casing  with the words "Front Toward Enemy" on it. It has two sets of adjustable legs. It is equipped with a knife edge style sight on currently fielded models (older models featured a fixed plastic slit-type sight which was not as effective for aiming and resulted in the mine being aimed too low, shortening the blast radius) and two detonator wells.
 
The weapon and all its accessories are carried in the M7 bandolier. An instruction sheet for the M18A1 is attached to the inside cover of the bandolier.