United System Research Base security guard

Security guards at the SERVEYOUinc-operated United System Research Base were under the command of August Hart.

They wore uniforms and helmets obscuring their faces and were armed to their teeth. (COMIC: Whodunnit?) Apart from following Hart's orders, they were in charge of enforcing station regulations, even such insignificant ones as the prohibition on running in the corridors. (COMIC: The Sound of Our Voices)

At least six security guards accompanied Hart in Hangar 18 to meet the intruders from the TARDIS. (COMIC: Whodunnit?)

One security guard was attacked by ARC and sent to a coma as the result.

Another security guard freed Hart from the interrogation room, where he was handcuffed to a table by the Eleventh Doctor.

At least five guards led by Hart laid an ambush for Alice Obiefune and John Jones near the TARDIS. (COMIC: The Sound of Our Voices)