Technical Realities

The Union of Concerned Scientists concludes that the Block 2004 GMD system is ineffective against real attacks due to a lack of realistic testing and vulnerability to simple countermeasures. The report critiques the Missile Defense Agency's (MDA) claims of high effectiveness, noting that the system's radars cannot discriminate warheads from decoys and that the deployment schedule is driven by political rather than technical milestones.

• The Block 2004 GMD system has no demonstrated capability to defend against real attacks because all flight intercept tests were conducted under 'highly scripted conditions' where the defense had advance information about the attack.
• The system is highly vulnerable to unsophisticated countermeasures, such as painting balloon decoys to match the infrared signature of a warhead, because the Block 2004 radars cannot discriminate between warheads, balloons, and debris.
• The Aegis SPY radar has limited tracking capability for long-range missiles, which would result in large uncertainties in the location of a threat cloud during an attack on Hawaii, potentially preventing the kill vehicle from locating the target.
• The MDA's claims that the system would be '90 percent effective' against a North Korean missile are described as irresponsible and lacking data, as the kill probability depends on attack characteristics that the MDA has not explicitly defined.
• Past intercept tests used unrealistic endgame conditions, including a closing speed of roughly 7.4 km/s, which is nearly half the speed expected in a real engagement, and provided the kill vehicle with highly accurate tracking data via GPS or C-band beacons.
• The deployment of additional interceptors will not meaningfully improve system effectiveness because the fundamental limitation is the low kill probability caused by the system's inability to counter simple countermeasures.
• The deployment schedule is not 'event driven' by technical progress; instead, the date for initial operations has been advanced while the testing schedule has slipped, suggesting the timeline is driven by the presidential election.
• The MDA has no current plans for independent, operationally realistic testing of the GMD system, which is a departure from standard 'Fly Before You Buy' military procurement laws.

APA

GRONLUND, L., WRIGHT, D. C., LEWIS, G. N., & III, P. E. C. (2004). Technical Realities. Union of Concerned Scientists. https://www.ucs.org/sites/default/files/2019-09/technicalrealities_fullreport.pdf

Chicago

GRONLUND, LISBETH, DAVID C. WRIGHT, GEORGE N. LEWIS, and PHILIP E. COYLE III. Technical Realities. Union of Concerned Scientists, 2004. https://www.ucs.org/sites/default/files/2019-09/technicalrealities_fullreport.pdf.

Wikipedia

{{cite report |last1=GRONLUND |first1=LISBETH |last2=WRIGHT |first2=DAVID C. |last3=LEWIS |first3=GEORGE N. |last4=III |first4=PHILIP E. COYLE |title=Technical Realities |publisher=Union of Concerned Scientists |date=May 2004 |url=https://www.ucs.org/sites/default/files/2019-09/technicalrealities_fullreport.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{gronlund2004technical, author = {GRONLUND, LISBETH and WRIGHT, DAVID C. and LEWIS, GEORGE N. and III, PHILIP E. COYLE}, title = {{Technical Realities}}, institution = {Union of Concerned Scientists}, year = {2004}, month = may, url = {https://www.ucs.org/sites/default/files/2019-09/technicalrealities_fullreport.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }