About 75 percent of the sailors who begin training to become Navy SEALs don't make it through the six-month program.
The grueling training is designed to create an elite special forces fighting team.
But it is not supposed to be lethal.
The San Diego County Medical Examiner's Office last week determined that the drowning death of Navy SEAL candidate James Derek Lovelace in May was a homicide.
A video taken of the incident, which occurred in a pool at Naval Amphibious Base Coronado, reportedly shows an instructor dunking Lovelace repeatedly.
Bob Schoultz, a retired Navy SEAL officer, provides some insight into what trainees go through during training on KPBS Midday Edition on Monday.