A list of names and addresses was posted on a website linked to ISIS alongside a call for them to be killed.
The group, which called itself the Islamic State Hacking Division, said it obtained the information by hacking servers and databases but US officials said most of the data was in the public domain.
It said the personnel named had participated in US missions against ISIS.
The group urged its supporters in the US to “take the final step” and “deal with” those named.
A US defense official, speaking on condition of anonymity, said: “I can’t confirm the validity of the information, but we are looking into it.”
The US and its allies have been conducting air strikes against ISIS militants in Syria and Iraq since last September.
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