The ads are an interesting look back at a time when the main selling point of a toy gun was that it looked just like the real thing! The art is fairly well done on the ads, if fairly standard. I think Crashryan is right, the ads do seem to be in part for parents. Maybe the idea was that the kid would show the ads to his folks, and they could then look it over and see the safety features. A lot of the ads show the kids in kid-sized army uniforms, but apparently Maco didn't actually make those.
I find it unaccountably amusing that someone did exactly two of the word scrambles on p. 20. Does the anti-aircraft gun on p. 27 seem way too large to anyone? The Talent Show set seems extremely out of place. I'm sure they could have thought of some sort of military theme for it.
As for the few actual stories (only 10 of the 36 pages), Battle for Hill 77 is very generic, not much to say about it. I must admit the ape on p. 14 got me laughing. "Valley Trap" was interesting. I've read a fair number of stories featuring the Marines in comics on this site, but never before one that ended with "the Marines retreated successfully". I suppose if you're going to tell true war stories of the Korean War, you're going to eventually have to confront the fact that America did not win.
And finally the order form! The advertising worked, sort of. Gregg there filled the form out, but I see it was never mailed in. I wonder if some kid was disappointed that they didn't get their field kit, or else if they forgot all about it soon after.