The response time of DIDS is 30 seconds over-all. Local receiving terminals begin to receive Warning Centers. a warning message within 1/2 minute after the warning officers at the three Warning Centers activate DIDS. Automated local sirens also begin to sound 1/2 minute after activation at the

Field tests conducted in 1966-70 show that the proposed DIDS transmitters provide reliable service to over 96% of the population. (Coverage for Alaska and Hawaii is under study.)

probability of receiving an understandable message. System reliability is very high. 99.9% of all receiving terminals have a 90% or better (See facing map.)

Receiver addressing is "built-in", so that groups of voice receiving terminals are activated communities. selectively. For example, it is possible to communicate essential crisis information directly to selected local governments without sounding sirens or alerting the general public in those

DIDS brings voice and radio-teletype warning messages directly to local governments and to selected radio and TV stations of the broadcast industry, which in turn alert the general public.

electromagnetic pulse effects of nuclear weapons. All critical elements of the DIDS system are provided backup power and protection from the

ATTACK WARNING SYSTEM WITHOUT DIDS versus WARNING SYSTEM WITH DIDS

(with DIDS full potential including home receivers)

LIVES SAVED WITH FALLOUT SHELTER AND WARNING, IN A "1975" ATTACK ON MILITARY FORCES AND POPULATION

(with DIDS full potential including home receivers)

Transmitter Facility

Location: Near Aberdeen, Maryland, on 160 acres.

Power: 50 KW; Assigned Frequency: 179 KH2; Antenna: 700 feet tall.

Construction: Westinghouse Electric Company

Hardened to 30 psi; EMP protected.

Maintenance and operation: U. S. Army Strategic Communications Command.

Location: State, City, County, and OCD Region 2 EOCs; Governors, State Adjutants
General, State Agencies; NAWAS points and broadcast stations.

Types: 1100 voice, 120 voice plus teletypewriter, 1100 siren activator.

EMP protected; battery operated where needed.

Maintenance: U. S. Army Strategic Communications Command.

Spring 1972: Delivery of electronics; tests begin.

Summer 1972: Facility construction complete; tests begin.

Winter 1972: Prototype facility operational in 10-State area.