Services during the Vietnam War Summit at the LBJ Presidential Library were interrupted by protesters on Tuesday.

The small group of protesters disagreed with the summit’s keynote speaker, former National Security Advisor Henry Kissinger. Kissinger has admitted to wrestling with some of his decisions during the war, but he eventually helped negotiate a cease-fire with his North Vietnamese counterpart.

One protestor said it’s an injustice Kissinger was invited.

"We can't stand for his politics in our country, it just isn't right," said Charles Holme.

University of Texas police and private security monitored the protesters, but Vietnam veteran J.R. Garza feels protests take away from the summit.

"It’s important for us to be here to remind the public of what it takes other than saying freedom is free, it's not free just look at these names," Garza said, referring to the Vietnam Veterans Memorial Wall replica at the library.

The memorial replica will be at the LBJ Library until Friday. Go here for more information about the Vietnam War Summit.