Diamond enlisted in the United States Army on October 14, 1918 and was honorably discharged on December 9, 1918.

[2][4][5] Diamond and his team made the first visual-type radiobeacon system that enabled a pilot to keep on course and to know his approximate position at all times while in flight.

Direction service could be given to any number of planes flying the course, and each airplane only had to carry a receiving set, with no other special equipment whatsoever.

Within about four months of the start of the program, Diamond’s group established feasibility of the radio proximity fuze through conclusive tests in bombs dropped at the Naval Proving Ground at Dahlgren, Va.

It was calculated that a fuze which would explode a projectile near a plane or at some height above a target on the surface would increase lethality.

Diamond, through his vast knowledge in the field of electronics, contributed greatly to the fundamental concept and design of proximity fuzes.