The joint exercise, which occurred this morning South Korea time, came shortly after officials said that the heads of the US and South Korean militaries had discussed "military response options" after North Korea's launch.
In a statement, the Army said the exercise involved the surface-to-surface Army Tactical Missile System (ATACMS) and South Korea's Hyunmoo Missile II.
The systems "fired missiles into territorial waters of South Korea along the East Coast July 5," the Army said.
The US and South Korean militaries conducted similar exercises after North Korea's first test of an ICBM on July 4.
Immediately after Friday's ICBM test, General Joe Dunford, who is Chairman of the Joint Chiefs of Staff, and Admiral Harry Harris, who heads the US military's Pacific Command, spoke with South Korea's Joint Chiefs of Staff Chairman, General Lee Sun Jin.
"During the call, Dunford and Harris expressed the ironclad commitment to the US-Republic of Korea alliance," Dunford spokesman Captain Greg Hicks said in a statement.
While the Pentagon has long planned for the possibility of conflict with North Korea, the blunt language in the statement marked a departure from previous public reactions to missile tests.
Those earlier reactions typically decried the tests but did not emphasise military options.
It was the first time Dunford, who has been in his position for two years, had issued a statement raising military options, though he has discussed the topic in public conversations.
Pentagon chief Jim Mattis, who is currently on vacation, slammed North Korea's first test launch of an ICBM on July 4 as a "provocation," but stressed then that the United States seeks a diplomatic solution to the standoff.
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