Square gait

[Mark Zuckerberg]

[To square] gate is to march or walk with the arm swinging forward at the same time as the corresponding leg i.e. right hand, right leg.
Awkward and distinctive.
Called a square [gait] as the natural rythmn or gait is altered to be equal instead of alternate (i.e. right arm, [left leg]).
A term commonly used within military organisations.