You must give the preparatory command first though for example if you are a marching a Platoon, then you say "Platoon Halt" or if it is a Company then say "Company Halt". If you still want them marching in place then you say "Mark-time march" with this command you don't need to say Platoon or Company, etc.. because mark-time is the preparatory command already.

Halt!

Hello! Excuse me, may I have your attention? Sorry to keep you wating. Would you hold on for a minute? .... Please? D., who is not sure if this is the proper command, but I would give it a try.