sentences:  The Troopers have also performed in concert before World's Fair attendees, NATO Defense College delegates, and Presidents Lyndon Johnson, Richard Nixon, Ronald Reagan, George H. W. Bush, Bill Clinton, and George W. Bush.The Troopers Drum and Bugle Corps is a 501 (c) (3) musical organization that has a Board of Directors, corps director, and staff assigned to carry out the organization's mission.The Executive Director is Mike Ottoes, the Corps Director is Kristy Jackson, and former director Fred Morris is a Senior Executive Advisor.