21. Robertson said the belligerents celebrated by firing tracer rounds in the air and there were some mortars fired. 22. At nightfall, red tracer rounds from heavy machine guns race up from the light of the city. 23. The A2 uses a faster twist rifling to allow the use of a trajectory-matched tracer round . 24. The friendly units should be within tracer burnout ( the range at which tracer rounds are visible ). 25. Tracer rounds lit up the night sky starting at 3 a . m . ( 1900 GMT Monday ).26. As soon as the three aircraft cleared the clouds, tracer rounds from small arms fire zipped by them. 27. Artillery fire and explosions could be heard near the airport, and tracer rounds raced through the blackened sky. 28. Note every fifth round is a red-tipped armor-piercing incendiary tracer round ( M20 ) . ]] 29. Hit again in the leg, this time with a tracer round which set fire to his clothing, Sgt. 30. Tracer rounds burn out to 800 m ( 875 yards ), and can be identified by their red tips.
