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According to the [[Government Accountability Office]] (GAO), these attempts failed due to immature technology, high cost, and affordability issues. SBIRS is to use more sophisticated infrared technologies than the DSP to enhance the detection of strategic and theater ballistic missile launches and the performance of the missile-tracking function.
The original contract consisted of 2 HEO satellite sensors and 2-3 GEO sensors (and satellites) with an option to buy a total of 5 GEOs. A complement of satellites in [[low earth orbit]] (LEO) was planned as part of the program (SBIRS Low), but this has been moved into the [[Space Tracking and Surveillance System|STSS]] program.
SBIRS continues to struggle with cost overruns,<ref>{{cite web | title=INTELLIGENCE AUTHORIZATION ACT FOR FISCAL YEAR 2000: Space-Based Infrared System-High (House Report 106-130)|date=7 May 1999 |publisher= [[U.S. Government Printing Office]]| url=http://www.gpo.gov/fdsys/pkg/CRPT-106hrpt130/html/CRPT-106hrpt130-pt1.htm}}</ref> with [[Nunn-McCurdy Amendment|Nunn-McCurdy]] breaches occurring in 2001 and 2005. By September 2007, the expected project cost had increased to $10.4 billion.<ref name="GAO-07-1088R">{{cite web | title=Space Based Infrared System High Program and its Alternative (GAO-07-1088R)|date=12 September 2007 |publisher= Government Accountability Office| url=http://www.gao.gov/htext/d071088r.html}}</ref><ref>{{cite web|url=http://www.cdi.org/friendlyversion/printversion.cfm?documentID=4122|title=CDI: Fact Sheet on Space Based Infrared System|website=cdi.org|accessdate=14 November 2017|deadurl=yes|archiveurl=https://web.archive.org/web/20071113202652/http://www.cdi.org/friendlyversion/printversion.cfm?documentID=4122|archivedate=13 November 2007|df=}}</ref> In December 2005, following the third SBIRS Nunn-McCurdy violation, the government decided to compete GEO 4 and 5, with an option to buy the GEO 3 contingent based on the performance of the first two.
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