The film about Pat Tillman, who gave up a professional football career to serve in Iraq only to be killed by friendly fire, uses the F word several times.
"It seems like the profanity in this movie lends to the profundity of the movie in celebrating who these people were," Brolin told The Hollywood Reporter.
Brolin slammed what he said was the unfairness of the Motion Picture Association of America system, whose R ruling was sustained on appeal before the premiere. Brolin told the Reporter he can take his two children "to see exploding head and blood and guts" in films and MPAA ratings "tell me that's OK."
"It doesn't seem very balanced to me," Brolin said. The Oscar-nominated Josh Brolin is the son of actor James Brolin, who was also on hand at the premiere.
The documentary favorably depicts the Tillman family, but also shows the family tolerated a lot of what Tillman's mother called "swear words." His brother used the F word in front of family, friends and dignitaries at his funeral, and Tillman himself used the F word as he was being fired on by fellow soldiers.
Celebrity Families of 2014 [PHOTOS]