What are these sensors on the Night Stalkers' Chinook MH-47G? What are these sensors (or lights) on this heavy assault Chinook MH-47G of the US 160th Special Operations Aviation Regiment, "Night Stalkers"?


Source, picture by Russell Hill

This regiment was the subject of Ridley Scott's Black Hawk Down.
Those sensors are part of the AN/AVR-2A Laser Warning System. Here is a closeup of the system components.

The AN/AVR-2A is a passive laser warning system which receives, processes and displays threat information resulting from aircraft illumination by laser designators, range finders and beam riding missiles. ... The AN/AVR-2A LDS consists of one interface unit comparator and four identical sensor units.; image from thaimilitaryandasianregion.wordpress.com
These sensors are installed on the MH-47G Chinook, as given in americanspecialops.com

Defensive systems
Common Missile Warning System (CMWS)
Suite Of Integrated Radio Frequency Countermeasures (SIRFC)
AN/AVR-2b Laser Warning System
XM216 Dark Flares (invisible to naked eye)