What's the difference

As a sergeant in a parachute regiment, I took part in several night-time exercises. Once, I was seated next to a lieutenant fresh from jump school.

He was quiet and looked a bit pale, so I struck up a conversation. "Scared, lieutenant?" I asked.

He replied, "No, just a bit apprehensive."

I asked, "What's the difference?"

He replied, "That means I'm scared, but with a university education."