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Helicopter takeoff. army soldiers on alert
Army sniper target on alert
The alert caracal looks attentively into the distance
The tank is on alert. Tankman
The F-16 fighter is on alert
Lynx with cubs is alert and always ready to protect them
Park alert Dog ears
The snow- covered husky is alert and looks
Aerial equipment is on guard. On the alert
The submarine is on alert at sea
The anti-terrorist group is on alert
Special forces on alert at night