https://www.cbo.gov/system/files/2021-03/57085-ground-combat-vehicles.pdf
http://www.koreatimes.co.kr/www/news/nation/2011/03/116_83997.html
https://nationalinterest.org/blog/reboot/expensive-worth-it-south-koreas-k2-tank-195732
https://www.defenceview.in/france-super-tank-leclerc-and-great-performance-in-the-middle-east/
https://www.janes.com/defence-news/news-detail/obsolescence-issues-could-increase-cost-of-leclerc-xl-upgrade
https://nationalinterest.org/blog/buzz/america-has-revamped-their-trident-nuclear-missiles-45852
https://en.wikipedia.org/wiki/Eurofighter_Typhoon#Bibliography
https://aerocorner.com/aircraft/eurofighter-typhoon-t1/
https://www.nbcnews.com/think/opinion/air-force-admits-f-35-fighter-jet-costs-too-much-ncna1259781
https://nation.time.com/2013/04/02/costly-flight-hours/
https://militarymachine.com/f-22-cost/#:~:text=The%20cost%20of%20one%20aircraft%20alone%20is%20an,per%20hour%20for%20an%20F-22%20is%20roughly%20%2470%2C000.
https://nationalinterest.org/blog/reboot/f-35-cost-fortune-was-it-worth-it-175774
https://armscontrolcenter.org/f-35-joint-strike-fighter-costs-challenges/
https://www.military-today.com/navy/seawolf_class.htm
https://www.thedrive.com/the-war-zone/24363/navy-wants-a-new-seawolf-like-attack-submarines-to-challenge-russian-chinese-threats
https://en.wikipedia.org/wiki/Triomphant-class_submarine#:~:text=The%20Triomphant%20class%20of%20ballistic%20missile%20submarines%20of,entered%20service%20in%201997%2C%201999%2C%202004%2C%20and%202010.
https://www.businessinsider.com/cost-of-navy-uss-ford-aircraft-carrier-2021-9
https://defbrief.com/2022/09/30/newest-us-carrier-gerald-r-ford-finally-starting-maiden-deployment/