An AH-64 Apache "Longbow" attack helicopter performs it's signature "pop-up" maneuver to allow the Longbow radar  (the disk shape object above the rotors) to locate and identify targets for a quick launch of a Hellfire missle before dropping back below the tree tops again. 
 
The AN/APG-78 Longbow is a millimeter-wave fire-control radar (FCR) target acquisition system and the Radar Frequency Interferometer (RFI), which are housed in a dome located above the main rotor.  The radome's raised position enables target detection while the helicopter is behind obstacles (e.g. terrain, trees or buildings). The APG-78 is capable of simultaneously tracking up to 128 targets and engaging up to 16 at once; an attack can be initiated within 30 seconds.  A radio modem integrated with the sensor suite allows data to be shared with ground units and other Apaches, allowing them to fire on targets detected by a single helicopter.
 
That's quite impressive!  A deadly game of "peak-a-boo" for the enemy....
 
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