inglês para português Outra Militar/defesa

Qual é a tradução de border guard, como no texto abaixo?


The delegation representing the plotters was pensive: Soon there would be no turning back. # # Mikhail Gorbachev was enjoying a few days' respite from Moscow's endless political rows at a secluded compound in Foros overlooking the Black Sea. Around midday on Sunday, several members of Gorbachev's 32-man security team tried to leave the area of the president's villa on routine business but were turned back without explanation by the uniformed KGB border guards who patrol the outer periphery of the compound. The uniformed troops answer to a different commander than the bodyguards and plainly were acting on orders the bodyguards knew nothing about.