Other mistake: During the scene when Pilla is killed there is a sniper on the roof of a building firing an AK-47 at the vehicles. If you look at his hands you'll notice they are caucasian. The other Somalis are black. (00:46:25)
Other mistake: When several of the Rangers are carrying Blackburn's litter up to the target building and they cross an intersection, you can spot an empty, stationary Black Hawk helicopter at roof level further down that alley/street as one of the Rangers fires at the Somalis. This was after all the Black Hawks had gone into their holding pattern. (00:48:15)
Other mistake: In one scene a pair of soldiers cut off from the main body of troops are trying to link up with some of their comrades. When the camera zooms in for a close-up of the soldier carrying an M-60 machine gun, the weapon appears to be loaded with a belt of blank rounds. (00:54:35)
Other mistake: During Mike Durant's capture the helicopter circling overhead that broadcasts "Mike Durant we won't leave you behind!" is the voice of Tom Sizemore who plays Col. McKnight - it even says so in close captioning." Col. McKnight was in the streets of Mogadishu engaged in battle at that time. (01:44:45)
Other mistake: The credits (and various websites) lists Canadian-born actor Kim Coates as portraying the character Wex, but he actually plays Master Sergeant Tim "Griz" Martin. (02:12:40)
Answer: Junior Reserve Officers Training Corps is an elective course offered by many high schools, and taught by retired Commissioned and Warrant Officers, and retired senior noncommissioned officers. They do learn military drill and ceremonies, but not tactics and techniques of combat. The goal is to produce a well-rounded high school graduate who can enlist in the military at a higher pay grade. The joke, or derision, has to do with JROTC cadets who can March and salute.