If you are asking if they have a monetary value then the answer is probably, "maybe." If you can find someone who is writing on the subject and would love to have original photos of the event to reference and use then you could find someone to buy them from you. You are however unable to control how they are used and what is ultimately done with them.
If you are asking about your own use that depends on whether you are interested in writing about either the Vietnam War or Princess Diana's wedding. If you are then they could be very helpful.