Fig. 2

Air flow velocities and direction at firing line for classes at WPAFB and JBC. A Air velocity measured over three days at WPAFB for the indicated class types. B Air velocity measured at JBC for the indicated class types. C Directional air flow velocities measured at WPAFB. D Directional air flow velocities measured at JBC. Measurements were made at each base prior to or after each of the M9. M4, and M4/M9 classes