Just a point on the ad. Restricted and Secret are two different things.
Restricted means anybody with a need to know the information ie any soldier can have access but it should not be transmitted to the press or general public. In other words, it basically has no security.
Secret is a security classification requiring the recipient to have been cleared to such level ie NOT any soldier. The only equipment manuals to have Secret classification are super high tech equipment, covert operations and some experimental models. Once the equipment reaches general issue it is pointless to have anything other than Restricted.
The Norden bomb sights of WW2 are a case in point. Supposedly Secret but so many people had access (ground crew, air crew, supply people) that the Germans almost certainly had the information before the first flight and definitely as soon as the first reasonably intact B17 or B24 hit the ground.
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