Is it just a coincidence that when individuals brag about having served in the US Special Forces,it's always The Navy SEALs ?

I was told by a friend of my grandfather, a retired high ranking US officer that the military has several Special Forces,Special Ops & Black Ops Units,for them to be affective they need to remain somewhat obscure as they would be basically useless if everyone knew about them,the members and their M/O but for public relations and as a recruitment enticement,the military decided to make one or two public and cooperate with TV/movie makers in their heroic portrayal in shows & movies.
Every time a good SEALs movie/show comes out recruitment shoots up !
In the 80s it was Delta Force but the Gov.decided to rescind that decision and substituted it with the Navy SEALs.
(The CBS TV show,, “The Unit” was based on Delta Force but the government refused to allow them to use the name and identifying insignias,had they chosen the SEALs,they would have received full cooperation )
My question is: why is it soooo many people now claim to have been in the Navy SEALs, is it just a coincidence ?
You never hear of anyone having served with any other Special Forces Unit “NOT” portrayed in the media.