Military Parade, North Korea

A military parade is a formation soldiers whose movement is restricted. The American usage is "formation or military review". The military parade is now mostly ceremonial, though soldiers from time immemorial up until the late 19th century fought in formation. Parades may also hold a role for propaganda purposes, as it is used to exhibit the apparent military strength one's nation.
Parades consist four directions: Advance, Retire, Left, Right
The Advance is the primary direction movement, regardless which direction the soldiers are actually facing (similar to a ship's bow.)