US officials say the United States can only take limited steps against allies on rights issues if it wants to avoid rival powers gaining influence.
"The targeted ISIS senior leader, Hamza al-Homsi, was killed," the Defense Department said.
A nuclear thermal engine for a space rocket could be three or more times as efficient as conventional chemical rockets.
The missile uses electro-optical systems to collect surveillance information and can take off and land in a soldier's hand.
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