Another thing about acronyms and initialisms that often causes confusion is whether or not one should place periods after each letter in order to be grammatically correct. Some grammar guides do advise doing so, but just as many say you should not, usually arguing that to add the periods can sometimes make things look messier and it’s already clear by the all-capitals that it’s an abbreviation, so the periods are pointless *snicker*. So really, it’s whatever you prefer as to whether to put periods after the letters of acronyms and initialisms or not. The important thing is just to be consistent throughout your writing.