1943 BRUSA Agreement
This document was signed on 5 March 1946 by Colonel Patrick Marr-Johnson ( who had headed the Wireless Experimental Centre in Delhi during the war ) for the U . K . 's London Signals Intelligence Board and Lieutenant General Hoyt Vandenberg for the U . S . 
<triplet> National Security Agency <subj> SIGINT <obj> field of work <triplet> UKUSA Agreement <subj> 1946 <obj> inception