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The Union Pacific freight train heading to Louisiana was estimated to be going at 62 mph at the time of the crash.

The veterans had been invited to Midland, a transportation and commerce hub in the West Texas oilfields, for a three-day weekend of hunting and shopping in appreciation of their service. A local charity, Show of Support, had organized the trip, parade and other festivities. Show of Support officials have declined to identify the driver.

Killed were Marine Chief Warrant Officer 3 Gary Stouffer, 37; Army Sgt. Maj. Lawrence Boivin, 47; Army Sgt. Joshua Michael, 34; and Army Sgt. Maj. William Lubbers, 43.

Hayden began his military career as an active-duty soldier from 1980 to 1988. He did two stints in the Oklahoma National Guard in the 1990s before signing up again for the Army Reserve in December 2003, according to Army records. He served in Iraq until March 2005 and was deployed to Afghanistan in 2009 until the following September.