It showed a large scale pigs head with flying cap and googles, stubble-beard, chompin' on a stogie.  I think he was leaning out through the surrounding ring border.
And I *think* the squad's motto was something like, "Oink! Oink! To War!"    I don't think it was assoicated with today's Pigs On The Wing, but I could be mistaken about that.  I remember reading somewhere the founding members of the squad hired an artist to create the logo, and it showed.  Very nice work, one of the all-time best I think.  I thought I had it saved somewhere but can't find it, and my internet searches are turning up zilch...