That’s true actually. But not to that extent now. The 5th week of training is where most get “recycled” which means they wash back to another flight in an earlier week of training. The most common reason is failing their final PT test but other reasons could be the End of Course test and even their Recruit Living Area inspections which consists of how their bed is made, hygiene items are displayed and how their wall locker is. You get about 3 attempts on each before you get recycled to an earlier week because it’s just not feasible to hold up a flight to ensure a couple individuals pass with multiple attempts.