Sniper Strike

We have a secret work for you today. It's not hard for you. In a base which the name is unknown to you, there are dangerous armed units. Your task is to destroy all enemies. It has a catch. They're well trained shooters, so you have to be very fast. You do not have the time to reload the weapon for a long time, and definitely there is no time for long aiming. There are many enemies so do not wait for anything. Kill them all and infiltrate to the secret base. Find out what's so important is hiding inside, when so many killers have been needed. Have fun.