The Secretary of Defense may authorize, without regard to the provisions of
section 3302 of title 31, use of proceeds from counterintelligence operations conducted by components of the military departments or the Defense Intelligence Agency to offset necessary and reasonable expenses, not otherwise prohibited by law, incurred in such operations, and to make exceptional performance awards to personnel involved in such operations, if use of appropriated funds to meet such expenses or to make such awards would not be practicable.