https://www.defensenews.com/smr/army-modernization/2020/03/25/lockheed-and-bell-will-compete-head-to-head-to-build-us-armys-future-attack-recon-aircraft/
https://www.defensenews.com/digital-show-dailies/ausa/2019/10/14/lockheeds-design-of-its-future-attack-recon-aircraft-touts-performance-at-the-x/
https://www.defensenews.com/land/2020/03/03/boeings-future-attack-recon-helicopter-has-no-name-but-3-rotor-systems/
https://en.wikipedia.org/wiki/Boeing_AH-64_Apache#Armament_and_configurations