Your son is dead for only one reason: I wasn't strong enough to stop it.
7 seconds sound clip from the A Few Good Men movie soundboard.
You can hear this line at 01:39:38 in the Blu-ray version of the movie.
Quote context
[...]
- Dear Mr. and Mrs. Santiago, I was William's executive officer.
- I knew your son vaguely, which is to say I knew his name.
- For my part, I have done as much as I can to bring the truth to light. And the truth is this...
- Your son is dead for only one reason: I wasn't strong enough to stop it.
- Always, Lieutenant Colonel Matthew Andrew Markinson, United States Marine Corps.
- Private, I want you to tell us one last time.
- Why did you go to Private Santiago's room on the night of September 6?
- A Code Red was ordered by my platoon commander, Lieutenant Jonathan James Kendrick.
[...]