Abbreviations and Acronyms

Some widely known abbreviations are required in certain situations, while others are acceptable but not required in some contexts. For example, Dr., Gov., Lt. Gov., Mr., Mrs., Rep., the Rev. and Sen. are required before a person’s full name when they occur outside a direct quotation. Other acronyms and abbreviations are acceptable but not required (i.e. FBI, CIA, GOP). The context should govern such decisions.

Example: Lt. Johnson was a dangerous man. 

http://owl.english.purdue.edu/owl/resource/735/02/

Nathan Hiransomboon
Editor, Three Penny Press