From GNU Collaborative International Dictionary of English, version 0.54: hep (hĕp), interj. A call used by drill instructors to count cadence during marching; used identically to hut and hup. [PJC]
hep (hĕp), interj. A call used by drill instructors to count cadence during marching; used identically to hut and hup.
[PJC]
