The U.S. military said Sunday it had ended its latest round of airstrikes on Iran, which included targeting Iran’s paramilitary Revolutionary Guard over an attack that killed American troops in Jordan.

Since the war began, 16 U.S. service members have now been killed and over 430 wounded.

The strikes came as a new statement attributed to Iran’s supreme leader Mojtaba Khamenei warned of “unforgettable lessons” for the United States.