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To defeat ISIS, we must become as ruthless as they are, Lt. Col. Ralph Peters (Ret.) said on "Fox and Friends Weekend" today.

Peters said that the top officials in the Obama administration don't have military experience, so they have a "fantasy" view of a bloodless war with zero collateral damage.

"You cannot win like that," Peters stated. "We have done an amazing job of minimizing collateral damage, to the extent that we're not being fully effective."

He said that as the Islamic State spreads around the world, our military strategy needs to be fundamentally changed if we are going to eradicate them.

He said that Obama's plan to lower civilian deaths by drone is not an effective strategy in defeating radical Islamic terror.

"You need a real commander-in-chief, not an apologist-in-chief," Peters said, adding that our military has become "PC" under this administration.

"The most important thing is to win. The greatest immorality is not an errant bomb that kills a child. The greatest immorality is for the United States and Western civilization to lose to barbarians."

Watch more above.

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