Hello, Vladimir, this combination has not yet been codified in major pronunciation dictionaries, perhaps due to the narrowness of its use outside technical areas; therefore, we should resort to analogy. Thus, acronyms of a similar type (featuring consonant + vowel + vowel + consonant ), including WAAC and WAAF, are pronounced as follows: WAAC ( Women's Army Auxiliary Corps) - [wæk] WAAF ( Women's Auxiliary Air Force) - [wæf] , from which it stems that a possible pronunciation of the combination in question is [wæs] , although it is still unclear whether this term has transcended the boundaries of a mere abbreviation and become a real acronym. Respectfully, Gleb Chebrikoff
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