progressive fire concentration

progressive failure

progressive maintenance

progressive stress test

consistent fire concentration

double consistent fire concentration

triple consistent fire concentration

fire а concentration

concentration of fire

concentration of fire on opportunity targets

deliberate concentration of fire

fire concentration

fire concentration call

massive concentration of fire

numbered concentration of fire

successive fire concentration

slant fire; diagonal fire; oblique fire; fire to the oblique

concentration along the key axes

concentration of forces and facilities

concentration of troops

killing concentration

lethal concentration

main concentration (of troops)

troop concentration

successive barrage / successive concentration

artillery concentration

concentration period

concentration point

vehicle concentration

infantry-armor-artillery-air concentration

oxygen concentration

ozone concentration

concentration of exhaust hydrocarbons