põhimõte, mille järgi peavad nii alalises valmiduses kui kiirreageerimisvalmiduses olevate üksuste varud olema pidevalt nende üksuste kasutuses ning üksuste tehnilised vahendid ja relvastus peavad ole, the probability that an item is in an operable and committable state when called for at an unknown (random) time [availability], the assurance that the essential supplies and services available to execute operations will achieve mission success [attainability]