Harry was expected to rappel down a wall Wednesday but instead will watch others do so.
He is still scheduled to participate in a target practice.
The death of the soldiers would be the biggest loss of life for British force in Afghanistan since a 2006 plane crash.
Harry is scheduled to visit Jamaica's popular north coast later Wednesday. He plans to take a helicopter tour of the area, visit a new cruise ship port in Falmouth and dine at the Sandals resort in Montego Bay.