Landmines.

Marching for hours, a group of Marien's come across a mine field.
"How are we going to get across?"
The Captian replied;
"Send the lowest rank."
The new Private steped foreward and said;
"I will go, Sir!  I just have one question!"
"What would that be?"
"What do we do if I step on a mine?"
The other Marien's looked at him as the Captian replied;
"Well it's simple.  You follow the useuall method, jump twohundred feet in the air and scatter your ass over an area of sixty feet!"