Recently, I have heard that is not true. It
used to be true.
The military is downsizing. They have been practically trying to invent ways to get Student Naval Aviators out of training by raising the bar in API very high. In fact, the Navy, in the recent past, has asked SNAs, awaiting flight school, if they would like to get out of the Navy with an honorable discharge. They waive their commissioning obligation. Similar offers were made to nucs awaiting school in Charleston. [There is one such student in medical school with one of my sons at Georgetown. He was a 2010 grad. They asked him if he wanted to get out and he took them up on the offer. Now he's going to be a doctor.]
There has even been talk about downsizing the size of the Brigade. The Air Force Academy has already started that process. The commissioning machine is cranking out officers (USNA, NROTC & OCS) in greater numbers than are needed.
Also, there was a previous USNA administration that was criticized for keeping midshipmen who should have been separated. They were giving 2nd, 3rd and 4th chances for some fairly egregious things that would have probably resulted in separation in the past.
The pendulum has swung in the other direction and there seems to be more of a "Strike one! You're out!" policy evolving. I'm probably overstating that a bit.
But there is certainly less leniency.