From the National Archives & Records Administran (NARA):
The “official” photos of individuals, taken by the military, are not considered to be permanent federal records by the respective military services and are not retained by the service. If the photo you are seeking still exists, it will most likely be found in the individual’s personnel folder.
The following information explains how to request the entire folder.Please keep in mind; however, there is no guarantee the photo will be present.
For the National Guard, we suggest you first contact the Office of the Adjutant General, for the State from which the veteran served.
If the records are not with that office:
They may be located at the National Personnel Records Center (NPRC) in St. Louis, Missouri.
Others need to use the Standard Form 180, but veterans or next of kin may use this form also.The Standard Form 180 can be printed from http://www.archives.gov/st-louis/military-personnel/standard-form-180.htmlhttp://www.archives.gov/st-louis/military-personnel/standard-form-180.html. This is a fillable form, so you may enter the information on your screen and print out the completed form.