A lieutenant was brilliant in military matters, but lacked a few social graces.  One day he called a soldier in to the office and said "Kramer, your grandmother died."

The soldier fell apart.  After he left, the colonel told the lieutenant, "You could have been a little more tactful.  I have some books at home that could help you."

The lieutenant read the half-dozen books lent him by the colonel and was ready for the next crisis.  Private Taylor's grandfather had passed away.

The next morning, at reveille, the lieutenant said, "Men, how many of you have a grandfather still living?  Not so fast, Private Taylor!"