PS: ooops...perhaps someone can identify markings on plane and helmet insignia on soldier standing to the left?
Oops, sorry about this, but I deleted the duplicate post for you and for some danged reason, it deleted the photo you posted from the first post. Sigh. Can you please re-upload for us.
And unfortunately, I have no way to get in touch with Joan. I do not have a viable email address for her, so the only way she will see this, is if she happens to stumble upon this post again.
Trust me I know the feeling!
Here are some pictures I took of the Sentinel at the Udvar Hazy Center:
