Sometimes the number and shape of stars are significant, sometimes not. I've seen a number that have "51" i.e. Area 51, indicated by number, shape of stars. Like 5 stars, then 1 off a bit, or 5 total and 1 is a different color. Probably coincidental, but on the second patch above the eagle...
Trevor Paglen has a book with a number of "secret" patches in it.
https://www.amazon.ca/Could-Tell-Then-Would-Destroyed/dp/193555414X
Here is a good source for stories on some of these emblems.