Yes
Normally DoD police are limited to wherever they are on duty, such as the base they are working on. However, DoD police officers may also be deputized by local police agencies or possess state-issued permits and carry under that authority.
DOD is Department of Defense. DOD Police are civilian police assigned to work on DOD installations.
If they have the power of arrest they should carry their credentials on their person.
Unlikely. DOD Police are civilian employees.
No
NO! the DOD do not recognized there civilian police officers as real cops I know because I'm a DOD police officer. This job is a joke and don't waste your time working with these idiot's. DOD civilian police fall under the job series 0083 from OPM and by OPM 0083's are federal cops, BUT if you work on a military base the military wont recognized you as a cop and will tell you that you cant arrest anybody.
A Federal Police Officer also know as 083 Police Officer as a position identifier is a uniformed Police Officer that patrols DOD property. A Police Officer on DOD property issues summons and arrests for crimes that have taken place. Since there is no Federal traffic laws, the Police Officers enforce state motor vehicle laws. When there is an infraction that has taken place on Federal property, and there is no Federal statue to charge the person with, the Police Officer charges the person with the state law.
Annually
The directive that grants Department of Defense (DoD) police arrest authority is DoD Directive 5525.4, which outlines the authority and responsibilities of DoD law enforcement personnel. This directive enables military and civilian law enforcement officers to enforce laws and regulations on DoD property and to make arrests for offenses committed within their jurisdiction. Additionally, the Uniform Code of Military Justice (UCMJ) provides a legal framework for military police to exercise their authority in specific circumstances.
The Department of Defense police are civilians and not subject to movement or deployment orders. Their standards and training are different from the military branch police, and they stand outside the military chain of command.
Not exactly certain what you mean by "credentials" but if they are authorized to make arrests they will have a "comission card."
DOD