Here is some more that you don't see alot of.

SC128589 - Second Army Maneuvers in Arkansas…Loading platform at Thebes, Arkansas. Light machine gun set up for action. Gunner Pfc. Urel Ellis, Ozan, Arkansas, No. 1; Pvt. Elliot Brown, Leavenworth, Kansas, No. 2; Pvt. Warren Anderson, Stephens, Arkansas. All three men are from Troop C, 10th Cavalry. Aug. 27, 1941.
SC128630 - Second Army Maneuvers in Louisiana…Sgt. Andrew Favors, Hqs. Troop, 9th Cavalry, with 45 Sub. Thompson machine gun. Aug. 30, 1941.

SC128688 - Second Army Maneuvers in Louisiana…Pvt. Chester Arthur Burnett, Picket line Troop G, 9th Cavalry (colored) from Aberdine, Mississippi, cleaning frog of horse, while Staff Sgt. Columbus Rudisal, Goffney, S.C., looks on. Sgt. Rudisal is directing Troop G, 9th Cavalry, 4th Brigade. Sept. 12, 1941.
http://www.history.army.mil/photos/W.../maneuvers.htm