TABLE 1

HEMP Simulator	Location	Status
ARES1 [DSWA]	KAFB, NM	Operational, recently upgraded.
FEMPS2 [DSWA]	San Leandro, CA	Operational.
HPD, VPD3 [Army]	KAFB, NM	Operational, planned for mothballing.
HPD, VPD4 [Navy]	Patuxent River NAS, MD	Operational.
Empress I, II4 [Navy]		Decommissioned.
Trestle5 [Army]	KAFB, NM	Mothballed.

¹ARES—A high-level, high altitude EMP (HEMP) simulator that can illuminate missiles and mobile ground equipment with threat level fields. Operated by DSWA at Kirtland AFB, NM.
²FEMPS—A smaller, high-level HEMP simulator that can illuminate racks of equipment and other smaller systems. Operated by DSWA.
³HPD, VPD—Horizontally Polarized and Vertically Polarized Dipoles that were originally built to provide high level field illumination of aircraft. They can also be used to illuminate mobile ground systems. Those at Kirtland AFB were originally built by the Air Force but have since been turned over to the Army and may be mothballed. Those at Patuxent River NAS are still used by the Navy to test aircraft.
⁴Empress I and II.—Surface ship HEMP simulators built by the Navy. EMPRESS I was on land and illuminated ships in the Chesapeake Bay. EMPRESS II was on a barge and was used to illuminate threat level fields on surface ships at sea. Neither simulator is now operational. EMPRESS II has been dismantled.
⁵Trestle—The Air Force built the TRESTLE facility to EMP test aircraft in an inflight condition. This facility has been mothballed.