The retail items for this year’s FOH are shown under special additions on this website. Since headcovers are not there, it might be something available only in the pro shop at American Dunes.

I just got back from American Dunes again and didn't see them there although I did find several items that I couldn't resist. This headcover may have been from an earlier year and I missed it. Thanks.
P.S. I did order some of the current items on the Titleist site.

They are usually available through titleist.com in the spring around Memorial Day, when Folds of Honor, with Titleist as a sponsor, holds Patriot Golf Days around the country. This year's was in Midnight Camo, for example. The one you see is probably from an earlier year

Titleist is a solid sponsor ot FOH and currently has some Folds of Honor items available under GEAR - special edition, BUT none of those at this time. Could have been from the past. I had a beautiful R/W/B Tour bag from years past. They were on eBay as well, selling for around $700 dollars. They were an item that clients earned their their golf ball purchases theur the year. They raffled them off around the end of the year and the dollars they raised were donated to FOH. I have not seen these before. but very well could be from promotions or special editions in the past. You finds all kinds of Titleist limited/special editions on their all the time. Some buy them up and sell them for a profit. My FOH bag, I passed it on to another veteran for a small amount, plus shipping. He offered me $100 if I ever wanted to sell it. As a DAV I appreciate their participation.

Unsure 0 might have been given at an event. I have the FOH head covers that I found on CMC Design web site. They make for all clubs and putter