Anyone here can recognize this engine part?

http://www.photolibrary.fema.gov/photodata/high/va_pentagon_0901_136.jpg
http://www.photolibrary.fema.gov/photodata/high/va_pentagon_0901_135.jpg

[Moderator: they are compressor or turbine wheels from a turbojet or 
turbofan.  Judging from the context (the Pentagon shortly after September 
11 2001, they are from a Rolls-Royce RB.211-535E4.]