The 160-page hardcover book 'Army Vinyl Records 1956 - 1967' was released. This private pressing contains over 280 pictures of Elvis Presley's army vinyl releases on glossy paper.
Previous releases are the 24 x 24 cm hard-cover books 'U.S. Demo and Acetates 1965 - 1993' (released February 2021, 460 pictures on 160 pages) and 'U.S. Demo and Acetates 1953 - 1965' (released January 2021, 660 pictures on 160 pages).
Very vague, but this is all the info there is.