The general in charge of the US Air Force's long-range nuclear missiles was sacked for conduct "unbecoming of a gentleman" during a business trip to Russia in July, a report says.
The newly declassified document says Maj Gen Michael Carey drank too much and met "suspect" foreign women.
He could not recall significant events or was "untruthful", the report says.
Gen Carey's removal came days after the Navy sacked an admiral overseeing nuclear forces over illegal gambling.
The two dismissals follow several other incidents affecting the US military's nuclear establishment.