First of all, I'm nearly certain that the Navy’s DevGru(Development Group) and the Army's Delta Force operate under secret code names. I think it is safe to assume that the Army and Navy units in JSOC train together so much they might as well be the same team. When you look at the candidate pools for selection-the Army Special Forces and 75th Rangers for Delta and the SEAL teams for DevGru, it is fairly safe to say that the Delta team is much bigger than the DevGru team. Interoperability and mission flexibility are major points of emphasis in this community. After all, Delta's original mission was to rescue hostages being held on airliners and DevGru's(SEAL team 6) original mission was to rescue hostages being held on boats and ships. The skills that these operators learned to conduct those primary operations and other counter-terrorism operations (mainly CQB) made them extremely talented at nearly every type of modern combat. It is probably very feasible that many missions are conducted with mixed teams. For example, if a Delta team was going to go on a mission and needed an extra operator that spoke Pashtun, they might pull a guy from DevGru. These guys are excellent communicators. They will sit down and pick teams based on individual skills and attributes that might be needed during specific missions.
As far as the Osama bin Laden mission, we wont know until the Dalton Fury of this mission decides to write a novel, making his co-workers extremely angry at him. The concept of the US government deceiving the media in saying it was a SEAL team instead of a Delta team is fairly plausible. From a public relations standpoint, there would have to be two DevGru operators involved in order for him to be telling the truth (he said SEALs). Operational security aside, if they were to say that “Delta Force” preformed the assault, every reporter in the nation would flock to Fayetteville, NC (Fort Bragg) to sniff out the secret “Delta compound” and find the guy who shot bin Laden. Press is not good for a unit like Delta Force. After the British SAS resolved the 1980 Iranian Embassy hostage standoff in London (NOT the US embassy incident in Tehran), hundreds of idiots signed up for SAS selection because they wanted to be James Bond. I imagine that the Osama bin Laden mission will continue to fuel the false perception that the regular SEALs(not DevGru) are the best unit in the US military. The next few BUDs classes will be packed for the first hour.
Lets remember that these units and other units like them overseas do us a great service even during peacetime. The concept of taking fifty hostages and requesting five million dollars and an airliner is ridiculous for any levelheaded person because of the work of Delta Force and DevGru. It might be Delta, DevGru, or FBI HRT-but someone will double-tap you in the head. The same goes for the Osama bin Laden assault. The community is one big team and everyone wins no matter who scored the goal in overtime.