As Ancient History as a U.S. Army Special Forces Officer, changed to a Joint Services Special Warfare Officer, tasked to make the U.S.M.C. Force Reconnaissance (Reconnaissance Only) to be more like U.S. Army Special Forces to Conduct Strategic Special Reconnaissance (SR) no Strategic Special Surveillance (SS), Direct Actions (DA, Raids, Ambushes, Assaults, etc.), limited Foreign Internal Defense limited due to no Language Requirements nor Cultural Anthropology, some Counter Terrorist Direct Actions but no Counter Insurgency Warfare (language requirements).
We did not train them to do Search And Rescue (SAR), Rescue Recapture Recovery (Triple R) Missions, nor Humanitarian Assistance (HA) Missions (language Skills Required and Medical Skills as Nurses or Physician's Assistants with Surgical Skills).
There was lots of resistance from the U.S.M.C., even though we wore U.S.M.C. Uniforms.
The Initial U.S.M.C. MARSOC Training we created was like U.S. Army Ranger School. Everything is carefully monitored, no extra food, no drugs not even over the counter drugs, not even a single aspirin. You get caught you are out. Prior to Training a Physical and Interview (Psychological), during the entire Training you are being evaluated Physically and Psychologically (this is the start of your Psychological Profile "Baseline" that future Annual and After Missions/Operations Psychological Screenings will be measured against).
Next was changing the U.S. Air Force Para Rescue Jumpers to be more like U.S. Army Special Forces. U.S. Navy S.E.A.L.S did not want to do any U.S. Army Special Forces Missions (months to years) just short duration (hours to days) Direct Action (DA) Missions as to why that TV Series S.E.A.L. Team is fake.