ID this little guy

[Navymedic]

here you go... (sorry pics taken with my iPhone)

 

[Avi]

looks like it's a Sergeant Major (Abudefduf vaigensis) to me.

 

[JamesJR]

A sergeant major. Not sure which one you have but more than likely is the carribean variety.

http://www.wetwebmedia.com/abudefduf.htm