Originally Posted by
Rhino power
Y-shaped duct, the inlet openings are outboard of the engine compressor face so, from head on, you don't see the compressor face which greatly reduces the radar cross section from the the head on aspect...*
-RP
* I'm sure there's a more technically accurate description available, but that's the basics.
Are you sure it's not just protective covers -- the image is from a different time, there's snow on the surrounding fields.