31. Machine-gun tracer rounds streaked scarlet across a muddy field at Fort Hood, home of the 1st Cavalry Division. 32. The military police also unleashed a barrage of tracer rounds into the sky toward them, wounding at least one person. 33. The ammunition is manufactured in three variations : the standard FMJ round, the tracer round , and a blank round. 34. Only the M196 tracer round was authorized for operational use, with the M199 dummy and M200 blank for training use. 35. The military police also unleashed a barrage of tracer rounds into the sky toward them, wounding at least one person there. 36. In World War II marine aircrew were issued tracer rounds with their side arms for emergency signaling use as well as defense. 37. After dark, the army staged an apparent show of force to frighten off the mothers : exploding shells and firing tracer rounds . 38. The "'57-N-231P "'is a tracer round designed for fire adjustment and target designation. 39. Tracer rounds , which are visible because they glow, are usually interspersed among other rounds, indicating more bullets could have been fired.40. Anti-aircraft fire could be heard near the airport, tracer rounds raced through the sky and artillery shells exploded in the air.
