After an earthquake shattered Haiti’s capital on Jan. 12, 2010, the U.S. military mobilized as if it were going to war. Before dawn the next morning, an Army unit was airborne, on its way to seize control of the main airport in Port-au-Prince. Within two days, the Pentagon had 8,000 American troops en route. Within two weeks, 33 U.S. military ships and 22,000 troops had arrived. More than 300 military helicopters buzzed overhead, delivering millions of pounds of food and water.

No two disasters are alike. Each delivers customized violence that cannot be fully anticipated. But as criticism of the federal government’s initial response to the crisis in Puerto Rico continued to mount Thursday, the mission to Haiti — an island nation several hundred miles from the U.S. mainland — stands as an example of how quickly relief efforts can be mobilized.

By contrast, eight days after Hurricane Maria ripped across neighboring Puerto Rico, just 4,400 service members were participating in federal operations to assist the devastated island, an Army general told reporters Thursday. In addition, about 1,000 Coast Guard members were aiding the efforts. About 40 U.S. military helicopters were helping to deliver food and water to the 3.4 million residents of the U.S. territory, along with 10 Coast Guard helicopters.

Leaders of the humanitarian mission in Haiti said in interviews that they were dismayed by the relative lack of urgency and military muscle in the initial federal response to Puerto Rico’s catastrophe.