Overkill Device

The Overkill Device was a weapon built by South Ossetian separatists that utilized sonic vibrations and was capable of activating any weapon from a gun, to a missile on a plane, to a nuclear missile in its silo.

History
S.H.I.E.L.D. learned of the existence of the Overkill Device when Agent Phil Coulson's team extracted Agent Shaw from his undercover assignment in Siberia.

With the intelligence provided by Shaw, S.H.I.E.L.D. learned that the South Ossetian separatists were planning on utilizing the Overkill Device in an attempt to declare their independence from Russia and Georgia.

S.H.I.E.L.D. planned an assault on the separatists, but needed a two-man team to go in ahead and deactivate the Overkill Device, lest it be used to against the assault teams.

To this end, Agent Victoria Hand sent in agents Grant Ward and Leo Fitz to neutralize the weapon. Ward and Fitz nwere successful in their efforts to deactivate the weapon, allowing for the S.H.I.E.L.D. strike force to successfully neutralize the separatists.

Trivia
In the comics, the Overkill Device is known as the "Overkill Horn".