The USAF bought just over 500 RF-4C recon Phantoms which entered service starting in 1964 -- just in time for the Vietnam War. I don't know the statistics, but I'm sure plenty were lost in that conflict. The RF-4C is often described as unarmed, which was mostly true, but the aircraft had a secondary mission of nuclear strike with a single B28 bomb on the centerline.
The Marines took advantage of all that Air Force development money to buy 46 RF-4Bs. After the Navy RF-8G photo Crusaders were gone, Marine dets operated from Midway and Coral Sea for a few years.
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