U.S. Army Sgt. Matt Vierkant (Ret.), a former member of Sgt. Bowe Bergdahl's platoon, told Bill O'Reilly tonight that Bergdahl had spoken to him about "getting lost" in the mountains in Afghanistan before he disappeared in 2009.

"At the time, it didn't really seem that weird," Vierkant said. "Hindsight being 20/20, it seems pretty weird now."

He said that after Bergdahl disappeared, there were non-stop missions for 30 days to try and find him.

"People's lives were put at risk. People died directly because he did walk away and chose to walk away," Vierkant said. "Ambushes went up exponentially. There were a lot more IEDs."

He said he doesn't understand why those who were injured or killed searching for Bergdahl won't be mentioned at the hearing to determine if Bergdahl should face a military trial on desertion and other charges.

Vierkant said that if Bergdahl is found guilty, he won't feel bad for him at all.

"He needs to pay for his actions," Vierkant said. "There are repercussions for your actions. There are repercussions for leaving your men and leaving your equipment and walking off and being captured."

Watch the clip above.

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