Question:
Which employer did Philip Franklin work for in Feb, 1918?

Context:
 Philip Franklin works for Massachusetts Institute of Technology from Jan, 1924 to Jan, 1964. 
 Philip Franklin works for Aberdeen Proving Ground from Jan, 1918 to Jan, 1919. 
 Philip Franklin works for Harvard University from Jan, 1922 to Jan, 1924. 
 Philip Franklin works for Princeton University from Jan, 1921 to Jan, 1922.

Answer:
Aberdeen Proving Ground