When a drug is likely to cause a severe side effect--say, an increased risk of heart attack, an allergic reaction that causes the skin to burn or liver failure--the standard practice is to warn patients and doctors about the product's labeling, and to send out warning letters to physicians who might prescribe the medicine.

FORBES: FDA Fix No. 5: Forget Labels

The official said it would be normal to warn other U.S. military branches that use 60mm mortars, such as the Army, about the Marines warning.

NPR: Mortar Explosion In Nev. Kills 7 NC Unit Marines