Recon Marines are NOT a special ops unit. They are a reconnaisance unit, and serve as the eyes of the Marine Expeditionary Force commander, locating the enemy so that he may be blown to Kingdom Come.
Special operations are more focused on unconventional warfare--counterterrorism and guerilla warfare.
A relative is a Marine, was in a Recon unit....from my recollection he trained with the Navy SEALS in California and either the Rangers or paratroopers (yeah, I know, big difference!) at Ft. Benning...
My recollection may be faulty; this was 10-15 years ago, (might also be colored by my affection for this particular relative!) but I was thinking they knew what the other units knew and then some.