Several military personnel were rescued by helicopter Friday in Colorado's Rocky Mountain National Park after some had trouble climbing one of the state's highest peaks.

Defense officials told Fox News that 11 Green Berets from Fort Carson in Colorado Springs were involved in a climbing training exercise Thursday on 14,259-foot Longs Peak, but a few of them had trouble continuing.

The group ended up spending the night. Rocky Mountain National Park spokesman Kyle Patterson said they're helping one another climb to the summit of Longs Peak and that rangers are helping as needed.

Two soldiers got altitude sickness, and the other soldiers decided to spent the night on the mountain, 10th Special Forces group spokesman Lt. Col. Sean Ryan told ABC News.

“No one is lost, missing or injured,” Ryan told the network.

The route the personnel are taking is not as technical as some but still requires climbers to cross a steep ice field and a ledge that is very narrow at points.

Fox News' Lucas Tomlinson and The Associated Press contributed to this report.