A total of 10 G550 EA-37B (renamed from EC-37B on 27-10-2023) Compass Call aircraft are planned to be acquired by the USAF. Some airframes have in recent years already been noted at Savannah (GA) and Brunswick (GA). In August 2022 it was reported that 5 aircraft already were in production at that time. 
N591GA (c/n 5591) visited Davis Monthan Air Force Base in August 2022. This to give the unit that will operate the aircraft (55th Electronic Combat Group) the opportunity to check out the aircraft. At this point the following airframes are destined to become the EA-37B: c/n 5567, 5579, 5591, 5602, 5608, 5612, 5618, 5622 and 5626. 

The Gulfstream G550 EA-37B Compass Call electronic warfare (EW) aircraft is being developed to provide improved electronic attack capabilities (disruption of  enemy command and control communications and suppress air defence networks of enemy forces) for the US Air Force (USAF) based on the Gulfstream G550 Conformal Airborne Early Warning Aircraft (CAEW) airframe, which is a derivative of the G550 business jet. It will also be used to attack enemy early warning and acquisition radar threats and perform counter-information operations. It is equipped with the existing Compass Call EW system installed on the ageing Lockheed Martin-built EC-130H Compass Call electronic attack aircraft. The EA-37B Compass Call aircraft is expected to provide enhanced stand-off jamming capability for the USAF compared to the existing EC-130H Compass Call, which has been operational with the USAF since 1982. The first aircaft N967GA / 17-5567 (c/n: 5567) made a fully equipped and painted testflight by L3Harris Technologies from Waco (TX) on 04-05-2023. After this it was delivered to AFMC Det. 1 of the 645th Aeronautical Systems Sq. at Waco (TX). The EA-37B aircraft will after testing be delivered to the 55th Electronic Combat Group (ECG) located at Davis Monthan Air Force Base in Tucson, Arizona.

The USAF announced its proposal to retire the existing fleet of EC-130H Compass Call aircraft from its service in 2014. The National Defence Authorisation Act (NDAA) for 2016 fiscal directed the USAF for a report on recapitalization of EC-130H Compass Call fleet to address future threats, either through a replacement programme or by installing Compass Call capabilities onto an existing platform. The USAF issued a request for information to aircraft manufacturers for their ability to provide commercial derivative aircraft integrated with the Compass Call system in October 2015. In early 2016, the USAF concluded that the future EW capability could be addressed by moving the existing Compass Call mission system onto a commercial derivative aircraft, based on the responses submitted by Boeing, Bombardier, and Gulfstream Aerospace. The USAF issued a classified justification and approval to award the sole-source contract for the Compass Call re-host to L3Harris Technologies (L3Harris), previously known as L3 Communications, in August 2016. It unveiled plans for the EC-X Compass Call replacement aircraft, under the Compass Call Cross Deck programme, in 2017. L3Harris was awarded a contract by the USAF in April 2017 to serve as the prime contractor for the integration of Compass Call EW technology into the Gulfstream G550 CAEW airframe. Gulfstream Aerospace was preferred to supply Gulfstream G550 CAEW airframes in September 2017. BAE Systems is responsible for the development, procurement, production, and integration of electronics and mission equipment for the EA-37B Compass Call EW aircraft fleet. The initial design review of the Compass Call weapon system was completed in 2017 and the work to transition Compass Call EW technology from EC-130H aircraft to the modern platform began in July 2018. L3Harris announced the completion of the first flight of the Compass Call aircraft on October 7, 2021. BAE Systems in partnership with the USAF successfully flight tested the Small Adaptive Bank of Electronic Resources (SABER) technology for the EA-37B Compass Call in April 2021. The tests were conducted at the Davis Monthan Air Force Base in Arizona.