The A18 was a heavy armor prototype used to create heavy armor sets during the Cold War

The Cold War Event Cold War (3653BBY - 3642BBY)

.
The basic kit, available in a variety of colors, consisted of pieces of medium armor covering the chest, back and lower legs. The advanced kit included a backpack and several additional elements of armor - shoulder shields, armor plates covering the chest and back of the wearer, as well as shin guards for boots.
Several prominent criminal organizations, including the Migrant Merchants' Guild

Migrant Merchants' Guild Organization Planetary and Sector

, Black Sun

Black Sun Organization Galaxy-Wide Organizations

and Hutt Cartel

Hutt Cartel Organization Galaxy-Wide Organizations

, based their armor on the A18 prototype.