I recently read that it's better not to put an article in front of initialisms that are used as adjectives

I don't know where you read that, but it's bad advice. Consider:

• He's now on the FBI's Ten Most Wanted list.
• The CIA operation in Honduras is now declassifed.
• Please show the inspector the CMMI documentation.
• He has been anchoring the NBC Nightly News for nearly a decade.
• Get ready for the SAT exam by working hard in school.

All of those constructs are perfectly fine. You can search for any of the bolded terms on Google (even in quotes) and see hundreds of thousands of hits.

I recently read that it's better not to put an article in front of initialisms that are used as adjectives

I don't know where you read that, but it's bad advice. Consider:

• He's now on the FBI's Ten Most Wanted list.
• The CIA operation in Honduras is now declassifed.
• Please show the inspector the CMMI documentation.
• This book details the history of the NBC network.
• Get ready for the SAT exam by working hard in school.

All of those constructs are perfectly fine. You can search for any of the bolded terms on Google (even in quotes) and see hundreds of thousands of hits.