If you ain't sharp enough to realize that on almost every mission you go on that you will be taking in everything you need to fight and survive on your back,you probably ain't smart enough to make it to a team.
And the paragraph is correct. Training Group is just the test,physical and mental,that you have to pass in order to be able to determine if what you have is good enough to allow you to go to a team,where you will be tested again virtually every day of your career. Your own attitude is key to everything. You have the basics,or you wouldn't have been accepted for the training,but the only way attitude can be tested is by surviving stressful surprises by putting you under a LOT of stress in a leadership position,and then pulling the rug out from under your feet to see how you respond.
Yeah,Training Group comes up with a series of scenarios to try to determine how well and how quickly you can adapt to changing circumstances "on the fly",but there is no course that can challenge you and kick your ass like real life. People who can adapt and adjust get to live. People who can't,are lucky to make it back home.
Where the rubber meets the road is completing the mission and coming back alive.
Even once you get on a team you will learn there are some teams that are basically training teams that do nothing but training and routine missions. The "high speed" (best) teams get to pick and choose who they want and who they don't want just like the other teams,but their standards are higher,and who they choose is entirely in the hands of the team sgt. He makes the decision,and doesn't have to explain his decisions to anyone. Which in real life is no big deal because if there is an empty slot on a team,the team sgt will come and ask you if you want to serve on his team. You have a right to say yes or no,but that's it.
On the other hand,the team sgt ALWAYS has the right to say "no" to any potential team mate the head shed tries to assign to him. It HAS to work that way,and if you are not chosen,it is NOT a slight on you. I once had a good friend refuse to accept me on his team because he was about 6'5" and 250 lbs,and thought I was too little to be able to pick him up and run with him if he got hit. There was nothing personal about it. He was the man who might live or die according to his decision on who replaced his dead assistant team leader,so he was the man that got to make the choice. Who can argue with that?
The good news is that once you get on one of the "high-speed teams",life is truly a wonderful and exciting thing. There are very few people in this life who can look around at the people around them and say with conviction "I trust every one of these people with my life,and they trust me with theirs". There are damn few people in civilian life you can trust to pay back a 20 dollar loan,never mind come charging through gun fire to throw you on their back and run to safety with you.
You will only understand what I mean when you are at a SF camp and word is filtering out through the radio room that there is a team surrounded and under fire that can't move,and they need an emergency extraction. You understand this when you grab your gear and run to the helicopters on the airstrip and find out you might have to fight somebody to get a space on one of the rescue choppers flying out. You will see SF guys there that aren't even on "go teams" due to jobs in supply,arms room,radio room,or dispensary,or because they are wounded, damn near coming to blows to try to get on one of the helicopters going out to land under fire in a small clearing in order to try to rescue wounded and surrounded SF guys. Some will even be officers,hoping to go out as just one more team member and rifle toter.
Sometimes they can't even land,and you have to rappel out of the helicopter on ropes while under fire.
That's when you will begin to really understand why nothing is more important than training,and nobody can ever have too much of it.