The amended manual, published today, also drops wording that equated journalism with spying.
These and other changes were made in response to complaints by news organisations, including The Associated Press, which expressed concern to Defence Department lawyers and other officials that updates to the manual published last summer contained vaguely worded provisions that commanders could interpret as allowing them to detain journalists for any number of perceived offenses.
The revised manual more explicitly states that engaging in journalism does not constitute taking a direct part in hostilities.
"Where possible, efforts should be made to distinguish between the activities of journalists and the activities of enemy forces, so that journalists' activities (such as) meetings or other contacts with enemy personnel for journalistic purposes do not result in a mistaken conclusion that a journalist is part of enemy forces," the revised manual says.
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"It is always a challenge for journalists to work in war zones, but it is particularly tricky when embedding with military forces because the missions are different," said Kathleen Carroll, executive editor of the AP. "It is important that the Law of War manual recognise that the roles each are different each important but distinctly different."
The manual's earlier version, published in 2015, said that while journalists "in general" are civilians, they "may be members of the armed forces, persons authorised to accompany the armed forces, or unprivileged belligerents."
A person deemed to be an "unprivileged belligerent" is not entitled to the rights afforded by the Geneva Conventions, so a commander could restrict such a reporter from certain coverage areas or even hold the reporter indefinitely without charges.