Halon, the U.S. military’s biggest supplier of firefighting equipment, has been shut down.

The Defense Department said it would shut down production at the Halon facility in the U-Makan region.

Halon was among the biggest customers for U.R.M.A. firefighting bombs, and it was widely used to fight the 2003 U.N. air strike in Lebanon, which killed about 1,400 people.

The U.K.-based Defense Logistics Agency said last month that Halon has been used to contain and extinguish fires since 1999.

In August, the company reported $10.5 billion in revenue and $9.9 billion in profits in the last fiscal year.