The Samson Option.
Strategically, Israel's long-range missiles, nuclear-capable aircraft, and possibly its submarines present an effective second strike deterrence against unconventional and conventional attack, and if Israel's defences fail and its population centers are threatened, the Samson Option, an all-out attack against an adversary, would be employed. Its nuclear arsenal can also be used tactically to destroy military units on the battlefield.
Quite an array of Israeli options, employing suitcase bombs, artillery pieces, submarine launched missiles, EMP bombs, ICBMs with Mirvs, neutron bombs and nuclear land mines, all of which the Israelis have on hand. Supposedly, they have hidden nukes deployed at the Golan Heights and the Sinai in order to destroy an attacking enemy army on land.