AP Style - drop those periods
AP has updated its headline style to allow US and UN, without periods.
The style with periods stays for now in text, but one wonders how long that will stick at a time when every micro-inch of paper is being put under scrutiny as a cost. (I also eventually expect to see the state abbreviations give way to the post office's two-letter versions in all uses.)
Another recent entry, this one new: The
(Muslim was used in the early e-mail alert of the change, but AP has now gone back and tweaked the online stylebook entry.)