Speaking to journalists on Friday, a senior U.S. defense official cited by reporters with Reuters, PBS, CNN and Fox News said that the HIMARS were having a significant impact in Ukraine’s fight against Russia. The official said that more than a hundred “high value” targets had already been taken out by Ukraine’s military with the weapons system.

Additionally, the official said that Ukraine has managed to take out “hundreds” of colonels, “many” generals and “thousands” of lieutenants and captains.

“They can’t keep it up forever,” the official said of Russia’s aggression against Ukraine. “They have expended a lot of their smarter munitions….Their capabilities are getting dumber.”