Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

[Q]: Context : The Ambushers is a novel by Donald Hamilton first published in 1963, continuing the exploits of assassin Matt Helm.
Answer : Matt Helm
[A]: Which series is The Ambushers apart of?

[Q]: Context : Oglethorpe's Regiment of Foot was an infantry regiment of the British Army formed for service in North America during the War of Jenkins' Ear.
Answer : British Army
[A]: Which armed forces utilised the service of Oglethorpe's Regiment?

[Q]: Context : Rear Admiral Katherine L. Gregory is the first female flag officer in the United States Navy Civil Engineer Corps (CEC).
Answer : United States Navy
[A]:
What military branch was Katherine L. Gregory in?