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At present, there are four active operators of Northrop Grumman’s RQ-4 family of HALE UAVs.
> NATO employs five examples of the RQ-4D Phoenix
> the Republic of Korea Air Force (RoKAF) owns four RQ-4B Block 30i Global Hawks
> the US Air Force (USAF) operates 20 RQ-4B Block 30s, 11 RQ-4B Block 40s and four EQ-4B Block 20s.
> The US Navy employs three RQ-4A Block 10s and five MQ-4C Tritons, which is the maritime variant of the Global Hawk family.
> The Royal Australian Air Force will also be a future operator of the MQ-4C, with plans to acquire six examples – three of which have already been ordered.