Mystery aircraft: Help needed

Hi,

a friend and I are unable to identify the WW2-era aircraft on this photo (no
caption or context available):

http://www.designation-systems.net/mystery.jpg

We think that the aircraft (obviously a glider) is connected to the U.S.
Navy's GLOMB ("Glider Bomb") program for remotely controlled gliders used
as surface-attack missiles. Several types of gliders were used in this
program, some (heavily??) modified from existing types, others
newly-designed. Unfortunately, the information on GLOMB in out sources is
incomplete and partially inconsistent, and we couldn't come up with a
really plausible ID for the aircraft.

So, any input would be much appreciated. Perhaps someone has that same photo
_with_ a caption ;-).

Thanks in advance!

Andreas