The true cost of war is a lot more than tanks, helicopters, and ammunition, according to US Senator Tammy Duckworth (D-IL), who joins GZERO World to reflect on the 20th anniversary of the US-led invasion of Iraq. Duckworth was a helicopter pilot who lost both her legs in Iraq, one of thousands of veterans who returned home wounded, and intimately understands that the costs of war go far beyond the conflict ending.

Is the United States fulfilling its obligation to provide adequate services for its veterans? In a conversation with Ian Bremmer, Duckworth emphasizes “the obligation we have to our veterans” to live up to the promises we made to them. The United States made a deal with its veterans, she says, “to honor their service and sacrifices,” and it is “non-negotiable to break that promise.” Otherwise, how can we expect people to volunteer to serve?