Overkill Device

"The intel you recovered from Agent Shaw tells us that a separatist group from South Ossetia has built a weapon called ezbiitomet." "The overkill device? - A little dramatic for my taste." "I imagine something was lost in translation."

- Victoria Hand and Grant Ward

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 in its holster, to a missile on a plane, to a nuclear missile in its silo.

History
S.H.I.E.L.D. first 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 infiltrate 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 were successful in their efforts to deactivate the weapon, allowing for the S.H.I.E.L.D. strike force to successfully neutralize the separatists.Leo Fitz modified the core and connected to portable energy source, and used it against separatist in their escape.

Similar looking devices, probably based on the original, were later used to neutralise weapons on The Bus by HYDRA soldiers, when S.H.I.E.L.D. was beind taken over by them.

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