After battles in recent years with Hamas and Hezbollah, Israel is getting ready in case there's another war in its future.
This week, Israel is conducting the largest nationwide emergency drill in its history.
Israel faces threats on nearly every border, and the past few days, much of the country practiced taking cover under the authority of Israel's Home Front command.
As part of the Home Front exercise, officials sounded the siren throughout the country. The aim of the siren is to prepare Israelis for an incoming missile attack.
The sirens sounded in cities and the countryside, but authorities paid special attention to the schools.
Children were evacuated to shelters, and some hit the floor.
Two years ago, the terrorist group Hezbollah fired more than 4,000 rockets into Israel during the second Lebanon war. Now, Hezbollah has a rebuilt arsenal of 20,000 rockets. And its leaders have threatened to strike back at Israel for the February killing of terrorist mastermind Imad Mughniyeh.
"We can get into war, and we need to be prepared. So, it's necessary, this drill," a high school boy said.
"Unfortunately, we live in a country where anything can happen. This just gives the feeling of-so the people can imagine at least what they are supposed to do," said one woman.
Hospitals and firefighters also took part in the exercise, rehearsing for a possible chemical or biological attack.
Even those who didn't take part could learn what to do by watching public service announcements on how to take shelter.
Some of Israel's enemies have warned that the drill is a signal that Israel is about to go to war. But for Israelis, the exercise is one more step to protect themselves from foes who have shown they can and will attack.