President Trump made a surprise visit to Dover Air Force Base in Delaware on Thursday evening with the first lady and conservative actor Jon Voight by his side.

Photos from the president's visit to the base show Trump saluting the flag-draped caskets of David Knadle, 33, from Texas, and Kirk Fuchigami Jr., 35. The two were helicopter pilots killed during a crash in Afghanistan this week.

The Army says it is investigating the incident that led to the two soldiers' death.

Voight was at the White House on Thursday to participate in the National Medal of Arts and National Humanities Medal ceremonies.

Trump's most recent trip to Dover was in January when he paid tribute to four Americans killed in a suicide bomb attack in Syria, according to the Washington Post.

Trump has often spoken of the grief of gold star families, and describes consoling them as "one of the toughest parts of my job."

Voight told the Post that Trump invited him to come to Dover.