Since this question was never answered:
I'm sure you mean that you would like to find/know of an MOS which consists of taking pictures, essentially. Depending on what level at which you wish to do this, you may or may not require extensive clearance.
US Army:
MI
96R (35H) Ground Surveillance Systems Operator
Not quite what you are looking for, but the theory behind it is the same.
Public Affairs Branch
* 46Q Public Affairs Specialist
* 46R Broadcast Journalist
* 46Z Public Affairs Chief
This might be more of what you are looking for.
USAF:
Support
3N - Public Affairs
3V - Visual Information (
http://usmilitary.about.com/od/airforceenlistedjobs/a/afjobvisual.htm )
I cannot find anything on the Navy, but you may be able to ask someone who's in about a specific rating.
USMC:
43 Public Affairs
Enlisted
* 4300 Basic Combat Correspondent - GYSGT-PVT
* 4313 Broadcast Journalist[1] - MGYSGT-PVT
* 4341 Combat Correspondent - MGYSGT-PVT
46 Combat Camera (COMCAM)
Enlisted
* 4600 Basic Combat Camera Marine - SSGT-PVT
* 4611 Combat Illustrator - SSGT-PVT
* 4612 Combat Lithographer - SSGT-PVT
* 4616 Reproduction Equipment Repairman[1] - SSGT-CPL
* 4641 Combat Photographer - SSGT-PVT <-------------Look!
* 4671 Combat Videographer - SSGT-PVT
* 4691 Combat Camera Chief - MGYSGT-GYSGT
Officer
* 4602 Combat Camera (COMCAM) Officer (II/III)
For a specific MOS, your best bet is USMC MOS 4641.
But don't take my word for it. Talk to a recruiter if there is another branch you wish to join which I have not specified.