1950's Attack on Iwo Jima?

Is this a correspondent photo of an alternate WWII reality? This was one of those photos that made me double and triple check the details. This is a photo of one of the many training assaults on Iwo Jima done in the 1950's and 1960's. At first glance one would think that it is a Battle Of Iwo Jima photo, but upon looking at the details such as the boots and field equipment it is a much later photo. Until Johnson Administration gave back Iwo in 1968, Iwo served as a training area for amphibious assaults.