Thomaston was already drydocked for cleaning 3 weeks ago. She was undocked on Monday and left Mare Island for Texas 2 days ago, so yes, this is Point Defiance. Sperry is scheduled to be towed next on the 28th.

Here is the USS Point Defiance in better days: http://www.navsource.org/archives/10/12/1231.htm

Thanks Chris and Bob I think you got the right class of ship. Here is Thomaston in better days:
http://en.wikipedia.org/wiki/File:USS_Thomaston;10122801.jpg

It is either the ex USS Thomaston or USS Point Defiance, both of which were laid up at Suisun Bay in 1998.

"Thomaston" Class LSD Dock Landing Ship

Ship was spotted being towed by two tugs around 10:45AM, 9-8-2011 being pushed out of Carquinez Straits, near Benicia, CA, USA in route to dismantling operation at Mare Island, CA.