Welcome to Matt's Army Humor!
As he was drilling a batch of recruits, the sergeant saw that one of them was marching out of step. Going to the man as they marched, he said sarcastically:
"Do you know they are all out of step except you?"
"What?" asked the recruit innocently.
"I said -- they are all out of step except you!" thundered the sergeant.
"Well, sarge, you're in charge -- you tell them!"