THAAD is a ground-based weapon system being developed by the Ballistic Missile Defense Organization and the Army to defeat theater ballistic missiles by colliding with them while in flight. The system supports the national objective of protecting U.S. and allied deployed forces, population centers, and industrial facilities from theater missile attacks. The total estimated cost for THAAD is $16.7 billion, and the system is currently in an early phase of development called demonstration and validation. A decision on whether to proceed into the engineering and manufacturing development phase is scheduled for March 1997. A production decision is planned for early 2003, and initial fielding is currently scheduled for 2006. DOD’s budget submission for fiscal year 1997 requests $481.8 million for the program. The fiscal year 1996 National Defense Authorization Act requires a contingency capability—THAAD UOES—by fiscal year 1998. UOES will consist of 40 interceptors; 4 launchers; 2 radars; 2 battle management/command, control, and intelligence units; and associated support equipment. Except for the 40 interceptors, these components have already been acquired under the existing THAAD demonstration and validation contract. The components are to be refurbished for use in the UOES system. The 40 interceptors are yet to be acquired under an option to the demonstration and validation contract. Figure 1 shows the principal UOES components. Initially, the Army had no specific plans to test the 40 UOES interceptors. However, in 1995, the Ballistic Missile Defense Organization’s general counsel ruled that use of research, development, test, and evaluation funding to acquire the interceptors would be justified only if (1) there were a planned intent to use them in early testing, (2) they were not principally intended for operational purposes, and (3) they were necessary to provide an adequate number for testing. In response to this ruling, the THAAD Project Office developed a test plan for the interceptors, but recommended that it not be implemented. The Ballistic Missile Defense Organization instructed the Project Office to implement the test plan. Since that time, circumstances have changed. Part of the test plan has become obsolete, and other parts can be accomplished with equipment other than the 40 UOES interceptors. Five of the UOES interceptors were to serve as backups in tests that have now been canceled; another four interceptors were planned as backups for engineering and manufacturing development tests; and one was planned as a backup to a limited user test. As a result of changes in planned demonstration and validation phase testing, it now appears that an adequate number of backup interceptors will be available for engineering and manufacturing development and limited user tests without the UOES interceptors. The remaining 30 UOES interceptors were to be used in operational suitability tests that did not involve firing interceptors. However, the purposes of those tests can be accomplished with training rounds or with the backup demonstration and validation phase interceptors. The Army anticipates exercising the contract option for the UOES interceptors in the 3rd quarter of 1996 based on the results of only the first 7 of 14 scheduled demonstration and validation flight tests. The Under Secretary of Defense (Acquisition and Technology) established one successful intercept of a target while using the THAAD radar to guide the interceptor as minimum criteria for exercising the contract option for UOES interceptors. Test flight 7, currently scheduled for about July 1996, will be the first intercept attempt using the THAAD radar. Through May 1996, the Army had conducted five flight tests. Only two of the five tests were designed to intercept a target and both intercept attempts failed. According to the Ballistic Missile Defense Organization and the Army, seven tests will not be sufficient to characterize operational effectiveness in such areas as mission performance and supportability. The Army also plans to conduct a 7-week limited user test after completing the 14 demonstration and validation flight tests. The limited user test will build on the results of the demonstration and validation flight tests and focus on operational effectiveness and suitability issues, including mission performance and system supportability. The primary events to be conducted during the limited user test will be field training exercises, command post exercises, modeling and simulations, and a flight test using an interceptor already under contract. Results from the limited user test are not scheduled to be available until early 1998. According to DOD’s Joint Staff, information currently available is not sufficient to characterize UOES operational effectiveness. Representatives of the Joint Staff told us that if a national emergency occurred, the national command authority would decide whether to deploy THAAD UOES based on the threat at that time and whatever data was known about UOES effectiveness. They agreed, however, that better data for making a deployment decision would be available at the completion of the limited user tests. The Joint Staff representatives also told us that some theater commanders place a high priority on THAAD’s intended capabilities. The Joint Staff expect that at the completion of the demonstration and validation flight tests and the limited user tests, sufficient information will be available to characterize UOES operational effectiveness. However, under the current plan, results from the limited user tests are not scheduled to be available until about 1-1/2 years after the Army exercises the contract option for the 40 UOES interceptors. The airlift requirement for UOES will be significant. The Army estimates that to transport the full system with 40 interceptors from the United States to a theater of operation will require up to 18 C-5, 26 C-17, or 40 C-141 flights. The Army estimates that a UOES initial force, or “minimum launch capability,” including 1 radar, 2 launchers, and 20 interceptors, could be deployed with 7 C-5, 9 C-17, or 13 C-141 flights. However, whether for a complete UOES deployment, or a minimum launch capability, the necessary flights may not be available unless UOES is afforded a high priority. In September 1995, the Ballistic Missile Defense Organization’s Annual Report to the Congress stated that deciding what assets should be transported in the crucial first days of an overseas campaign will present a critical challenge and that the need to transport large inventories of equipment to regional theaters of operations will stress airlift capabilities. Representatives from the Joint Staff told us that THAAD UOES would likely have a high priority for airlift resources. However, other systems may also have a high priority. For example, the Army plans to begin fielding 1,200 Patriot Advanced Capability-3 interceptors in 1999, which could compete with the 40-interceptor THAAD UOES for airlift resources. Since September 1992, when the THAAD demonstration and validation contract was awarded, the contractor’s cost estimate for the 40 UOES interceptors has increased by over 100 percent—from $80 million to $165 million. According to THAAD project officials, the contractor’s estimate is likely to increase further because funding for the interceptors has been stretched out over a 4-year period and the delivery period has been extended from 29 months to 34 months. The estimated cost for spares, support equipment, and contractor support increases the estimated total cost of a UOES deployment option by another $55 million—to a total of $220 million. At our request, THAAD project officials categorized the interceptor cost increase. They stated that the increase in interceptor cost is due to technical, estimating, and schedule changes. Technical cost increases result from design changes to the interceptor’s seeker, booster, and divert and attitude control system. Estimating cost increases result from correcting errors in the initial cost estimate and shifting other costs from the contractor to the government. Schedule cost increases occurred because the time from exercising the contract option to final delivery grew from 18 to 29 months. Final delivery of the 40 UOES interceptors has been delayed about 2 years—from the 2nd quarter of 1997 until the 2nd quarter of 1999. Under the current schedule, UOES interceptor deliveries would begin in 1998. At the end of fiscal year 1998 when the 1996 Defense Authorization Act requires the UOES capability, only 14 interceptors will be available. Exercising the option for the UOES interceptors has been delayed about 10 months, from October 1995 until about August 1996, and the time from exercising the option to final delivery has increased 16 months. The 10-month delay results from slips in the demonstration and validation flight test schedule. These slips occurred largely because of scheduling difficulties at the test range and the failure to intercept the target during test flights 4 and 5—the first two tests designed for target intercept. The Army maintains that a successful intercept using a test range radar to guide the interceptor should occur before attempting an intercept with the THAAD radar. The Under Secretary of Defense (Acquisition and Technology) is requiring the Army to conduct a successful intercept using the THAAD radar before it can exercise the option for UOES interceptors. The first intercept attempt relying on the THAAD radar is now planned during test flight 7 in the July 1996 time frame. The 16-month delay in delivery results from (1) extended lead times—from 18 to 29 months—in delivery of some interceptor components and (2) reduced fiscal year 1997 funding that further extended final deliveries from 29 to 34 months. The current plan for acquiring THAAD UOES interceptors commits funds for interceptor production in about August 1996, well before testing in early 1998 provides some assurance of the system’s effectiveness. In view of the risks associated with producing UOES interceptors before testing, we believe the Army should delay contracting for them until the testing is completed. Using 34 months as the time required from contract award to final interceptor delivery, UOES would still be available as an interim system in late 2000. This is about 1-1/2 years later than currently planned but well before fielding of the final THAAD begins in the 2006 time frame. Accordingly, to avoid committing over $200 million for a system that may not have adequate operational effectiveness, we recommend that the Secretary of Defense (1) restrict obligational authority for UOES interceptors until the Chairman of the Joint Chiefs of Staff certifies that UOES has adequate effectiveness to merit deployment as an interim system and (2) seek legislative relief from the requirements of the 1996 National Defense Authorization Act in regards to acquiring THAAD UOES by fiscal year 1998. In commenting on a draft of this report, DOD disagreed with our recommendations, stating that THAAD UOES will serve three functions in priority order: (1) providing soldiers an opportunity to influence the system’s design; (2) conducting early operational assessments of the system; and (3) if directed by the National Command Authority, providing a theater commander in chief with a limited missile defense capability. We do not disagree with these purposes and would point out that the two primary purposes of UOES set forth by DOD—early user influence on the design and system operation assessment—can be accomplished without contracting for the 40 interceptors. Moreover, the thrust of our report deals with the risks inherent in the Army’s accelerated approach of contracting for interceptors to be deployed before testing provides assurance of the interceptor’s effectiveness. DOD stated that the requirement for successful hardware-in-the-loop testing of kill vehicle subsystems and one successful intercept using the THAAD radar will reduce the risk associated with contracting for the 40 interceptors. However, we note that these minimal criteria are even less than the three successful intercepts required for entering the engineering and manufacturing development phase. Our work has repeatedly shown that when production of weapon systems began on the basis of schedule or other considerations rather than on the basis of technical maturity, major design changes were often needed to correct problems. The design changes frequently led to additional testing and costly retrofit of units already produced. DOD stated that implementing our recommendation would cause a gap in production of interceptors between demonstration and validation and engineering and manufacturing development. However, DOD failed to point out that the current schedule already includes a production gap between demonstration and validation and engineering development and an even larger gap between completing production of interceptors for engineering development tests and the beginning of low-rate initial production. Implementing our recommendation would widen the gap between demonstration and validation and engineering development but decrease the gap between engineering development and low-rate initial production. DOD also stated that implementing our recommendation would permit a UOES capability no sooner than fiscal year 2000, 2 years later than required by law. We recognize that implementing our recommendation would not allow DOD to provide a THAAD UOES capability by fiscal year 1998 as required by the 1996 National Defense Authorization Act. For that reason, we recommended that the Secretary of Defense seek relief from the act’s requirement. However, under the current THAAD schedule, only 14 interceptors will be available at the end of fiscal year 1998. The Army’s definition of “minimum launch capability” includes 20 interceptors or 6 more than will be available in fiscal year 1998. The full 40-interceptor capability will not be available until the 3rd quarter of fiscal year 1999, even if no additional schedule slips occur. Because DOD has clearly indicated its intention to commit over $200 million for UOES interceptors that may have inadequate operational effectiveness and because the current schedule will provide only 14 of the 40 interceptors by fiscal year 1998, the Congress may wish to consider delaying the timetable for acquiring THAAD UOES set forth in the 1996 Defense Authorization Act. The Congress may also wish to restrict obligational authority for acquiring UOES until the Secretary of Defense certifies that the system has adequate operational effectiveness to merit its deployment in a national emergency. We performed our work at the Office of the Chairman of the Joint Chiefs of Staff, Office of the Secretary of Defense, Headquarters of the Ballistic Missile Defense Organization; the Department of the Army in Washington, D.C.; and the THAAD Project Office in Huntsville, Alabama. At these locations, we interviewed responsible agency officials and analyzed pertinent documents. We obtained comments on a draft of this report from DOD. Those comments are discussed above and reprinted in appendix I. We conducted our work from June 1995 to May 1996 in accordance with generally accepted government auditing standards. We are sending copies of this report to the Secretaries of Defense and the Army; the Director of the Ballistic Missile Defense Organization; and the Director, Office of Management and Budget. We will make copies available to others upon request. This report was prepared under the direction of Thomas J. Schulz, Associate Director, Defense Acquisitions Issues. If you or your staff have any questions concerning the observations expressed in this report, please contact him on (202) 512-4841. Major contributors to this report were Lee Edwards, Leon Gill, Stan Lipscomb, and J. Klein Spencer. The following are GAO’s comments on the Department of Defense’s (DOD) letter dated May 13, 1996. 1. We recognize that the Theater High Altitude Area Defense (THAAD) User Operational Evaluation System (UOES) has three purposes—(1) providing soldiers an opportunity to influence the system’s design; (2) conducting early operational assessments of the system; and (3) if directed by the National Command Authority, providing a theater commander in chief with a more robust theater missile defense architecture than exists today. The two primary purposes of UOES set forth by DOD—early user influence on the design and system operation assessment—can be accomplished without contracting for the 40 interceptors. The thrust of our report deals with the risks inherent in the Army’s accelerated approach of contracting for interceptors to be deployed before testing provides assurance of the system’s effectiveness. 2. The current THAAD UOES schedule provides only 14 of the 40 interceptors by fiscal year 1998—the date the 1996 Defense Authorization Act calls for a UOES capability. Delivery of the 40 interceptors will not be completed until the 3rd quarter of fiscal year 1999. The first copy of each GAO report and testimony is free. Additional copies are $2 each. Orders should be sent to the following address, accompanied by a check or money order made out to the Superintendent of Documents, when necessary. VISA and MasterCard credit cards are accepted, also. Orders for 100 or more copies to be mailed to a single address are discounted 25 percent. U.S. General Accounting Office P.O. Box 6015 Gaithersburg, MD 20884-6015 Room 1100 700 4th St. NW (corner of 4th and G Sts. 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Summary: GAO reviewed the Theater High Altitude Area Defense (THAAD) User Operational Evaluation System (UOES) program, focusing on whether planned testing would reasonably demonstrate the capabilities of UOES as an interim system before funds are committed to interceptor production. GAO found that: (1) the Army purchased 20 interceptors for demonstration and validation flight tests, of which only 14 will be used in these tests; (2) the Army plans to commit funds for UOES production based on the results of the first 7 of the 14 scheduled flight tests; (3) transporting UOES interceptors from the United States to a theater of operations will require significant airlift resources that may not be available unless UOES is afforded a high priority; (4) the cost estimate for the 40 UOES interceptors has increased from $80 million to $165 million, and THAAD project officials expect that estimate to rise to $220 million; and (5) delivery of the 40 UOES interceptors will be delayed due to increased delivery lead times and reduced fiscal year (FY) 1997 funding.