The allowable threat objects passing through a BMD system expressed as a percentage of the threat. To ensure overall system performance, permitted leakage is "budgeted" among individual BMD phases and functions
Ballistic Missile Defense, Glossary, Version 3.0, Department of Defense, Ballistic Missile Defense Organization, Defense Pentagon, Washington, DC, USA 1997. https://www.google.com.kw/search?q=Ballistic+Missi le+Defense+Glossary.+Version+3.0%2C+June+1997& rlz=1C1BLWB_enKW586KW586&oq=Ballistic+Missile+ Defense+Glossary.+Version+3.0%2C+June+1997&aqs =chrome..69i57.881j0j4&sourceid=chrome&es_ sm=122&ie=UTF-8, (Ballistic Missile Def - Amer) {1025}