Here is arguably one of the most famous US photographers of WWII, Life Magazine's Robert Capa. This was taken shortly before he jumped with the 507 PIR, 17th Airborne Division into Germany in Operation Vartsity. Notice his camera type. Possibly the same one that used making his famous Omaha Beach photos.
Most US photographers wore standard combat uniforms and equipment. Only their cameras and lack of weapons set them apart from the troops around them. Obviously those at an airfield will be wearing uniforms and headgear appropriate for that setting as opposed to those parachuting into enemy territory.