Do you think the SAS should train the Delta Force and the Navy Seals to make them better?
Well obviously you do not have a clue what you are talking about. The American delta force is based on the SAS. The first commander of the Delta Force had served in the SAS before hand as an exchange Officer. All special force already cross train with each other and have exchange members. IE: There are SBS member serving with the Seals, SAS members serving in Delta, Delta members serving in the SAS, Seals serving in the SBS. They also cross train and exchange member with the German Kampfschwimmer and (GSG-9) . The French GIGN and naval commandos. the Italian COMSUBIN and Pronto Impiego.
