https://www.military.com/military-fitness/ask-stew-what-are-best-fin-options-swimming-and-diving
The type of fins to use for swim workouts completely depends on your goals and current abilities.
askstewbestfinoptions
https://www.armyrecognition.com/focus-analysis-conflicts/navy/naval-technology/video-report-defense-conseil-international-dci-new-military-diving-school-for-eod-divers
Video report: Defense Conseil International (DCI) New Military Diving School for EOD Divers
defense conseil internationalvideo reportmilitary divingdcinew