The SF Duty Identifier Tab / Patch with the black border is for those assigned to the Security Forces career field as a first responder. It is worn on the top of the left sleeve of the operational camouflage pattern uniform. These duty identifier patches are currently used in the United States Air Force (USAF) and/or the United States Space Force (USSF), each career field is authorized to have these patches, pending the acronym approval from their career field manager.