On Sunday Iran's Revolutionary Guard tested five new missiles in a waterway that is critical for oil supplies and transportation.
They tested various types of missiles including coast-to-sea and sea-to-sea weapons.
According to the New York Times, "The Guards' exercises in the Gulf and the Strait of Hormuz coincided with rising tension between Iran and the West, which says Tehran's nuclear work is aimed at making bombs. Iran denies this."
CNN also mentioned that the war games also included an exercise that used high-speed boats attacking a larger warship.
According to CNN, there have been other Iranian military tests in the past but this one was notable because they announced it in advance.
According to the New York Times, "Iran, a predominantly Shi'ite Muslim state, has said it would respond to any attack by targeting U.S. interests in the region and Israel, as well as closing the Strait of Hormuz. "
This strait is the waterway that allows people to control oil traffic in the Middle East.