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The National Guard and U.S. military have sent assistance to the site of massive fires in Northern California that have burned hundreds of homes and spurred the evacuation of tens of thousands of residents.

The help comes amid a staffing shortage on the fire lines that has caused officials to make wrenching decisions about what areas to save and which ones to let burn.

The Guard is providing helicopter support along with a dozen 20-person crews to fires throughout the state, and the military has sent several C-130 aircraft specially equipped to act as air tankers, said Jeremy Rahn, public information officer for the LNU Lightning Complex fire in Northern California.

Gov. Gavin Newsom announced Saturday that the White House had approved California’s request for a presidential major disaster declaration to bolster the state’s emergency response to wildfires burning in Northern California.

Read the full story on LATimes.com.