The mighty Ohio class was nuclear ballistic missile submarine is operated by the US Navy. 
 
Number of Pieces Required: 3,723
 
REAL DIMENSIONS:
Length:  560'
Beam:  42'
Displacement:  18,750 tonnes  (submerged)
 
MODEL DIMENSIONS:
Length: 46.4"      (You're gonna need some shelf room for this one...)
Width:  4.7"
 
Easy-to-follow, full-color, step-by-step instructions are in PDF format.   Files are in ZIP format and need to be uncompressed.   *INCLUDES XML FILE for easy Bricklink purchasing of parts.