I think there was a strong sense of closed secrecy and just tacturn "keep it to yourself" attitudes. So using your spec-ops background to self-promote feels a little gauche although certainly plenty of military folks do it (and often OVER-do it). Not sure how much jealousy there is between these groups, (other than the marines towards everyone else because they have ZERO money for anything aside from crayons ) versus the press over emphasizing some over others. Obviously in the 80's we had several Delta Force type films after their more public activities, then it moved to SEALs.