During the 1940s, Schneerson became a naturalized US citizen and, seeking to contribute to the war effort, he volunteered at the Brooklyn Navy Yard, using his electrical engineering background to draw wiring diagrams for the battleship USS Missouri (BB-63), and other classified military work.
I know many Chabad men who went to college and graduate schools earning doctoral degrees using them in business, industry and as professional educators.
In New Haven, where I grew up The Rebbe sent Rabbi, Dr. Maurice I Hecht to start the yeshiva during WWII. The previous Rebbe knew the importance of sending a man with full academic credentials when opening a school in a community containing Yale University. Rabbi Dr. Hecht was considered on equal status with non-Frum Congregation ‘rabbis’ such as Rabbi Dr Robert Goldburg and Rabbi Dr Arthur A Chiel. When money for a yeshiva,day school, camps, etc has to be raised from the Jewish community as a whole and the Menahel has to appear and speak in many public forums, being fully educated and polished with the title Dr. is important.