FRESH CLAM is used to help differentiate which foot drill commands are called on which foot. This only applies when the cadet is marching. FRESH is an acronym for movements called on the left foot, and CLAM is an acronym for commands called on the right foot. Think of it as reading from left to right, fresh (L), clam (R). Included in the image below, in red, are the PROPER timings as per the 201 for the movement.
Change Step (1, 2, Left, Right, Left)