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The original contract consisted of 2 SBIRS HEO satellite sensors and 2-3 SBIRS 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 US$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|access-date=22 December 2010|archive-date=4 March 2016|archive-url=https://web.archive.org/web/20160304041154/http://www.gao.gov/htext/d071088r.html|url-status=dead}}</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|access-date=14 November 2017|url-status=dead|archive-url=https://web.archive.org/web/20071113202652/http://www.cdi.org/friendlyversion/printversion.cfm?documentID=4122|archive-date=13 November 2007}}</ref> In December 2005, following the third SBIRS Nunn-McCurdy violation, the government decided to compete SBIRS GEO-4 and SBIRS GEO-5, with an option to buy the SBIRS GEO-3 contingent based on the performance of the first two.<ref name=geo56contract />
On 2 June 2009, [[Lockheed Martin]] announced it had been awarded a contract for the third SBIRS HEO payload and the third SBIRS GEO satellite, and for associated ground equipment modifications.<ref>{{cite web |url=http://www.lockheedmartin.com/news/press_releases/2009/0602ss-sbirs.html|title=U.S. Air Force Awards Lockheed Martin US$1.5-Billion Contract For SBIRS Follow-On Spacecraft|publisher=Lockheed Martin |date=June 2, 2009|url-status=dead|archive-url=https://web.archive.org/web/20090605074247/http://www.lockheedmartin.com/news/press_releases/2009/0602ss-sbirs.html|archive-date=June 5, 2009}}</ref> On 10 July 2009, Lockheed Martin was awarded US$262.5 million as down payment by the USAF towards the purchase of a fourth satellite.<ref>{{cite news |url=https://www.reuters.com/article/rbssIndustryMaterialsUtilitiesNews/idUSN1026553020090710|title=Lockheed gets US$262.5 million U.S. satellite down payment|work=Reuters|date=July 10, 2009|first=Julie
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