Not typically. Only the "e" does that usually (although, of course, there are exceptions. Even within this sentence.

)
acolyte - is not pronounced with a long a. To be fair, I suppose, you do have acorn. But that is an exception. Acoustic, pharmacology, draconian. It's very much the exception for an "o" to make an earlier vowel long. And, since Thaco is an acronym, and the A is for Armor, I'm really not sure where the long A comes from.
(And, before anyone brings up USA - we don't say that one as a word - we pronounce the letters. Acronyms are pronounced as words, generally, when it makes sense. Although, thinking about it, NATO is pronounced with a long A. Sigh.

)