Do not understand the decline since in their Premium selection there is a photo in stock of Vietnam Memorial Wall almost identical. Just not as good as this one. ;>] I've just gotten started with the Stock program and need to understand the rules of the game, I guess.
You need to appreciate the importance of releases. They are for our protection against legal action. There are certain little details that you will discover as you go along that will get some of your photos approved. I mentioned one in my reply above.
Instead of lashing out against the moderators who are trying their best to protect us, why don't you attach the link of those you said are close to yours so we can have a better discussion as to possibly why they are approved?
Usually famous landmarks are prohibited. I cannot say for the examples you speak of since you have not included the links in your post. However it is likely they are generic, or include public space. Please take a look at the guidelines at https://helpx.adobe.com/stock/contributor/help/property-release.html in details for more information.
Your photo appears to be totally taken on restricted property.
I think people expect moderators to be infinitely knowledgable, even psychic in some cases. For example, they don't include a property release for art BECAUSE THEY PAINTED IT, though how could the moderator know? Or, no model release for what turns out to be a self-portrait. Similarly, they aren't military historians (may not even be in the USA). If it looks like it MIGHT need a release, best to include one - help them out! By supplying a release you're taking liability if it turns out not to be true - Adobe like that, but as yours will be true, that's fine too...