Air Force General's Parade Cap, but without wings ?

[plmurphy]

I purchased this cap recently and there is one thing about it which confuses me. It does not have the wings on the upper part of the cap which are normally present on air force visors caps. I know that prior to 1957 non flying officers in the air force wore the cap without the wings but this particular cap is dated 1964.

Can anyone advise me as to the reasons for this ? Is my understanding of the date of the regulation change incorrect (the most likely explanation) ?

Regards,

Paul