Mike - the A-24 Banshee was the step sister to the Dauntless, the SB2U was the bird the Dauntless replaced, it looked somewhat like the Helldiver (in a granny sort of fashion
) here is a link to it:
http://www.military.cz/usa/air/war/bomber/sb2u/sb2u_en.htm
as for the (shoreside) VT-8 not being VMT-8, it's because it was a Navy unit. I'll check into it and see why the identical names for the squadrons, perhaps it was split? I'll get back to ya on that though. Good replies! It's making me have to think through some things I either took for granted or didnt hit me in the first place! (like two VT-8's)