3-18. Face in Marching:

3.18. Face in Marching. The command is Right (Left) Flank, MARCH.  On the command MARCH, the airman executes a 90-degree pivot on the ball of the right (left) foot and, at the same time, steps off with the left (right) foot in the new direction with coordinated arm swing. The pivot and step are executed in one count, and proper dress, cover, interval, and distance are maintained.

(NOTE: This copy of paragraph 3.18. Face In Marching, has been corrected from the published version found in AFMAN 36-2203, dated 3 June 1996.  CadetStuff.org's staff has contacted the POC for AFMAN 36-2203 at Lackland Air Force Base and confirmed that the paragraph as presented in the manual is incorrectly written.  Additional (left) and (right) supplementary instructions for this command were inadvertently added in the editing process, but are actually not correct for the execution of the command.)