A potential surgeon candidate would have to hold the discipline of going through eight years of school and 3-8 years of internship/residency. This could possibly take up to 16 years of schooling just to be in their position. During surgical procedures, they must stay focused/concentrated in the task at hand or it could cost the patient their life, possibly followed by a stressful malpractice lawsuit. Fine motor and eye coordination has to be spot on in order to finish a simple task required on top of the 100 other essential steps ahead. They must have all distractions swayed away and focus clearly on the patient's problem. Their on call mostly 24/7 and live a life of stress which can lead to marital and personal problems.
A Navy SEAL has to go undergo one of the most, if not the hardest, training programs ever known to man. Score well on the required subjects on the ASVAB, 20/20 vision, and be physically conditioned prior to selection to BUD's. However, during BUDs training, there is a phase known as "hell week," which weeds out the people who don't really want it. You have to have it down physically, emotionally, and most of all, mentally. This will push the candidate to the biggest challenge they have ever faced in life. Once they become a SEAL, they will be assigned to a team and deploy for a certain amount of time. While deployed, they will have the ability to invade, assault, and escape like ghosts. It's as if it never happened. This takes a deep level of skill, determination, confidence, and ability to execute.
I'm neither of these professions, but I found these two to be the most respected/demanding fields.

