Todd is a Major in the army. He is also the narrator's friend and had borrowed a dollar from the narrator a year ago.
                  The narrator had lent his friend Todd a dollar which the latter has forgotten to pay back. ... He does not give a reason for it except that there are quite a few of his other friends too who owe him a dollar and have forgotten about it
                 The moral of the story is that small or big, one should return the money owed to others. That amount may be important for the lender. Further, it gives a great pain to the lender, if the borrower totally forgets about money borrowed. An honest man remembers the help done by friends.