Skill is the ability to do something well and one can be skilled without being creative.
Expertise is having high level of knowledge and understanding, this may or may not mean they have skills and certainly has no reflection on creativity.
Experience brings about skills and expertise but not creativity.
Creativity can be enhanced by all of the previous and in photography you may be creative with lighting, creative with composition, creative with capturing the right emotions, creative in using the camera or lens. If one is not creating the scene it does not remove any creativity since they are still creating the image.
To classify war photographers, news photographers or any type of photojournalism as being 'non-creative' is saying they are only good at the skill set of operating a camera. If that is the case, since it takes little skill to push a shutter button, then all war photography would look the same and those awards they win would be meaningless.
My security camera points down at my truck from the garage roof 24 hours a day shooting thousands of still shots every time it senses movement. No creativity, just doing the same thing someone with high skills at pushing a shutter button would be doing. This is the same as how you classify the photo-journalist!
If I go out there I will use my creative thinking process along with my skill set, expertise and experience to evaluate the best lighting to show properties of my truck I wish to enhance. I will use my skills to adjust the camera settings while using creativity to determine angle of light, angle of lens, DOF and composition of the image.
I have as much creative opportunity in determining these factors within the image as you have physically moving the objects where you want them.
Two war photographers with the same skill sets, expertise, experience and equipment will walk away from an event with two distinct images due to the creativity factor. To say they need no creativity and only a skill set is an insult to their profession.