"It's all because of the elements, dirty water and hygiene," he said. "You see a lot of despair and depression."
With a large amount of donated pharmaceuticals, the team was able to provide care for some of the residents, he said.
Rueckert said despite the countless humanitarian efforts on behalf of the country, a lot remains to be done.
"The city is a mess. The city is devastated," he said.
He said there are still hundreds of thousands of people living in tents.
He said he did not see much organization in the recovery efforts, but there were many missionary teams donating time.
United Nations soldiers patrolling with machine guns and the French military were also visible presences, he said.
In conversations with Haitians, Rueckert said, many expressed gratitude to the U.S. and appreciate the humanitarian efforts so far.