1 definition by mike at DoD

hammer down

pentagon developed protocol referring to destroying an area to isolate an incident or event

PRYCE - If you wanna go out in this, I ain't gonna stop you. But you gotta know somethin'. The government's considering the Hammer Down protocol, which means they're willing to let this whole area go.
ROB - You mean Midtown?
PRYCE - No, I mean Manhattan.

by mike at DoD January 18, 2008