Rob Riggle plays Col. Max Bowers, former battalion commander of the 5th Special Forces Group. Riggle, a Marine, actually served directly under the real Bowers during the same time period the movie is based on.
Gen. Abdul Rashid Dostum was quoted as saying, "I asked for a few Americans, they brought with them the courage of a whole Army", according to Robert Young Pelton in his March 2002 "National Geographic Adventure" article "The Legend of Heavy D and the Boys". Pelton was the only journalist with the Green Beret and CIA team whose story is featured in "Horse Soldiers"
Chris Hemsworth and Elsa Pataky play a couple in the movie. They are married, with kids, in real life.
"Dostum", the last name of the Uzbek general, means "my best friend" in Uzbek and many other Turkic and Indo-European languages.
The film is based on Doug Stanton's non-fiction book "Horse Soldiers", which tells the story of CIA paramilitary officers and U.S. Special Forces personnel in addition to USAF Combat Controllers, sent to Afghanistan immediately after the 9/11 attacks.
Michael Peña and Micheal Shannon both appeared in World Trade Center (2008), based on the events of 9/11, with Shannon playing a former Marine who turns up at the site to help with the rescue efforts.
Although much of the filming took place near White Sands Missile Range, the scenes involving military encampments were not part of an actual US army installation. The structures were leased from AKS Military, a private company. AKS also provided the military structures for Transformers (2007).
This is the second time William Fichter has played a member of Delta Force. He played a composite character in Black Hawk Down (2001) and plays Col. John Mulholland here. Mulholland, then a major, was a staff officer in Delta Force at the time of the actual battle in Mogadishu that inspired Mark Bowden's book and the movie.
Navid Negahban, who plays Gen. Dostum, and Numan Acar who plays Mullah Razzanm have both appeared as villains in different seasons of Homeland (2011) and will star together in Aladdin (2019).
Second collaboration on real-life events among Thad Luckinbill, Kenneth Miller and Geoff Stults, the first being Only the Brave (2017), about the Granite Mountain Hotshots who died in a forest fire.
The "paperweight" that the female soldier uses on the unrolled map is a Motorola 9500-series satellite telephone.