kõik kaitsvad meetmed, mille eesmärk on avastada, tuvastada, tõkestada ja hävitada või muuta ebatõhusaks vastase üksustest lähtuv õhuoht
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AJP-3.3.1 ja AJP-3.3 kasutab defensive counter air'i air defence sünonüümina.
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Defensive counter-air (DCA) operations protect friendly forces and vital interests from adversary air and missile attacks; as such it is synonymous with air defence (AD). DCA consists of all active and passive air defence operations to detect, identify, intercept, and destroy or negate adversary air and missile forces attempting to attack or penetrate friendly battlespace, or to nullify or reduce the effectiveness of such attacks should they escape destruction.
Active and passive defensive measures designed to detect, identify, intercept, and destroy or make ineffective forces attempting to attack or to penetrate friendly airspace.
