The chairman of the U.S. Joint Chiefs of Staff is hosting a meeting at the United Nations to follow up on countries' pledges of troops for United Nations peacekeeping operations.

Gen. Joseph Dunford's visit Friday marks the first time a sitting Joint Chiefs of Staff chairman has ever spoken at the world body, U.S. officials said.

Deputy British chief of Defense Staff Gen. Gordon Messenger is a co-host of the meeting.

The meeting seeks to provide an update on pledges made at President Barack Obama's 2015 Leaders' Summit on Peacekeeping, where countries promised nearly 50,000 troops for U.N. missions.

The officials declined to be identified because they spoke at a background briefing ahead of the closed meeting.