Photographer Kari Greer has spent years documenting wildfires and firefighters in much of the United States. In this photo, a firefighter works a low-intensity burn operation June 14 at Lincoln National Forest in New Mexico. Kari Greer/USFS This is Greer's award-winning image of an Erickson Air-Crane dipping into a pond to fill its tank on the Oakhead Complex Fire in Osceola National Forest, Florida. The image won first place in the "aerial resources" category of a Fire & Aviation Management photo contest in 2004. Kari Greer/USFS
Greer's third-place image is of a helitorch being used on the Mad Creek Fire in Medicine Bow-Routt National Forests in Colorado. Kari Greer via U.S. Forest Service
Greer's second-place image is from the "wildland/urban interface" category of firefighters watching a retardant drop on the Burn Canyon Fire in Colorado. Kari Greer/USFS
Greer's first-place image in the "wildland fire" category shows intense heat coming from the Kinishba Fire in Arizona. Kari Greer/USFS
Greer's second-place image in the "wildland fire" category shows extreme fire behavior on the Blackhall Fire in Wyoming. Kari Greer via U.S. Forest Service
The Idaho City Hotshots firefighting team comes down after several nights battling Little Bear Fire in Lincoln National Forest in New Mexico on June 15. Kari Greer/USFS
Flames turn night into day along a road this month during New Mexico's Little Bear Fire at Lincoln National Forest. Kari Greer/USFS
A firefighter battles the Little Bear Fire on June 14 at Lincoln National Forest. Kari Greer/USFS
A crew mops up a day after a Little Bear Fire burn operation on June 15 at Lincoln National Forest. Kari Greer/USFS
A member of the Idaho City Hotshots pauses after taking on the Little Bear Fire at Lincoln National Forest. Kari Greer/USFS
Brush burns during the Little Bear Fire at Lincoln National Forest on June 14. Kari Greer/USFS
The flames appear to take on a life of their own at Lincoln National Forest this month. Kari Greer/USFS