 Although direction finding only indicated the movement of the radio, and no transmissions had been intercepted, it suggested the presence of the 275th Regiment, or at least a reconnaissance party of that unit.While deception could not be ruled out, Jackson took the threat seriously, and company patrols were sent out.The existence of a SIGINT capability was a closely guarded secret, and knowledge of the source of the reports was limited to Jackson, his two intelligence officers, and the 1 ATF operations officer; neither battalion commander had access.