General B.B. Bell said the weaponry are modern, solid-fuel missiles, which means that they are easy to handle and capable of being fired rapidly.
"These were successful tests," he said.
North Korea has carried out test of at least three short-range missiles in the past month.
North Korea test fired a missile on May 25, and another June 7. In May 2005, the country launched short-range missiles from its eastern coast, and in July 2006 a total of seven missiles, including the Taepodong-2, which has a range of up to 6,000 km (3,700 miles).
June 19, Japan's NHK TV reported that North Korea had launched a short-range missile towards the Sea of Japan for the third time in 45 days, but Yonhap later retracted the report stating that no missiles had been launched that day.
Pyongyang's weapons tests have raised international tensions over the country's nuclear program. The reclusive state is being pushed to meet its February commitments on disarmament, in particular shutting down its nuclear reactor in return for aid.
