The 29th Infantry Division was a military unit, infantry division of the Army of the United States of America during World War II. In a holonovel simulation of that 1940s conflict stored in the holodeck of Federation starship USS Voyager, the assignment patch uniform insignia of the 29th was worn by holographic characters who identified themselves as being part of the US 5th Armored Infantry, under Captain Miller. (VOY episode: "The Killing Game")
In reality, there was no such unit as the 5th Armored Infantry unit as part of the 29th Infantry in WW2's European theater of operations. The 29th was made up of the 115th, 116th and 175th Infantry Regiments, the 110th, 111th, 224th and 227th Field Artillery Battalions and the 121st Engineer Combat Battalion. It isn't clear if the military units were arranged differently in the universe of Star Trek, or if the discrepancy was in reality a shortcoming of the holoprogram's accuracy.