Traditionally for Vehicles (and Weapons) there is Faction specific Tracer Ammunition used, to make vehicles easier identifyable when they are shooting.
This is especially helpfull during night play.

However, some vehicles don't follow these rules and would need Faction specific Tracer Colors added:

B_G_Offroad_01_armed_F - 100Rnd_127x99_mag_Tracer_Yellow (needs to be red)
O_G_Offroad_01_armed_F - 100Rnd_127x99_mag_Tracer_Yellow (needs to be green)
I_G_Offroad_01_armed_F - 100Rnd_127x99_mag_Tracer_Yellow (correct)

B_Boat_Armed_01_minigun_F - 2000Rnd_65x39_belt_Tracer_Red (correct)
O_Boat_Armed_01_hmg_F - 200Rnd_127x99_mag_Tracer_Green (correct)
I_Boat_Armed_01_minigun_F - 2000Rnd_65x39_belt_Tracer_Red (needs to be yellow)