I live in Government quarters and would like to paint a mural on my
son?s wall.  Is there a paint I can use that will wash completely off
with soap and water or a mild non-damaging paint remover.  We can?t
paint the walls but if I can find something easy to get rid of I think
it will be cool.

Dear Mjoi, 

(1) Check your contract. Maybe you should repaint the walls to the
original colour when leaving, but may make changes. Many contracts are
like that. I mean, in any case, when you'll leave, there would be a
need to repaint the apartment, because of furniture marks and the
regular usage.

(2) I haven't found a paint that would be suitable (it is also hard to
believe that there is such a thing, because then it may not keep on
the wall), but I've found an idea for you:
(A) Fabric "Wallpaper" are very easily removable, and suppose to leave
no marks on the wall itself.
(B) Paint the mural on the fabric 
See: 
The Quick Fix Fabric on Walls 
<http://www.rentaldecorating.com/quick_fix_fabric_on_walls.htm>

Thank you so much!  I never thought about fabric.  That's just what I'll do!