Acronyms and initalisms for job titles and names of organizations, centers, buildings, forms, tests and assorted other objects are generally spelled without periods:
√ UTSA, USAA, NASA, FBI, UN, EU
√ CEO
√ FAFSA, SAT, TOEFL
Acronyms are made plural without apostrophes, unless the letter of the acronym is an s, in which case an apostrophe is needed:
√ GREs, SATs, DVDs, SOS’s