RCA in Camden was pretty hi tech in its day (my dad worked on radios and TV there in the 50's).
RCA had a facility along the New Jersey Turnpike for testing the AEGIS naval radar system. Add to that Singer Kearfott (inertial guidance system, Totowa), ITT (defence related electronics, Nutley), several Bell Laboratories facilities (Whippany did much of the work on Nike, Nike-X, Safeguard, some ASW related systems), Picatinny Arsenal, and other defence related companies.