In May 2017, KBR Inc was awarded a $514.9 million fixed-price contract which includes fire & Emergency Services at the Diego Garcia Atoll, located in the middle of the Indian Ocean. The award came after a protest (here) from the (then) contract holder Centerra-Parsons. However, KBR appears to hold the contract today.
Diego Garcia is a well known B2 Bomber Base which was a critical resource while fighting the War on Terror. The Fire department is primarily staffed with other country nationals such as Filipinos. The Leadership is all American.
Jobs available at Diego Garcia as of 26 Aug 2018
Here are some relevant links on Diego Garcia.