Focusing on military, foreign-policy, and political science themes; avoiding domestic policy not explicitly related to defense.
Primary sources are best: Studies, speeches and remarks and transcripts.
Secondary material is okay: Stuff that’s peer-reviewed or runs in professional journals, general background material from reputable sources (to include Wikipedia), long-form writing from major newspapers and magazines.
Opinions and editorials: If they include data.
Your own analysis or ideas on any of that stuff: If it’s more than a sentence or two, put it in the comments.
To actually submit something, email me (or comment on this page), and I’ll set you up with an account to post.