Reblogged from amastyleinsider:
Sometimes we see things out of the corner of our eye. Then we think, “Did I really see that?” Lately, I’ve had that experience with certain acronyms morphing from all capital letters (eg, UNESCO) to initial capital letters (Unesco).
When acronyms drop their periods, I take it in without a second thought—it looks cleaner to me, someone used to the omission of periods in most acronyms from years of editing using the AMA Manual of Style.
h/t Copyediting.com