AI overview
I don't have access to the specific context about "Template:PD-USGov-NASA" that you're referring to. Without seeing the actual template documentation or details, I cannot accurately write an overview based solely on what you've provided, as you've asked me to base my response only on context that hasn't been shared with me. If you could share the template's documentation or description, I'd be happy to write the overview you're looking for.
AI-generated from the Wikipedia summary — may contain errors.