Since it seems to be unclear whether Bradley/Chelsea Manning is a boy or a girl, there's going to be a problem at the Bureau of Prisons about who should be his/her cellmate, or even whether he/she goes to a men's or a women's prison.
The one thing that's sure to happen is that BOP will get sued. If they put him/her in a men's prison, Private Manning will sue. If they put him/her in a women's prison, the women will sue.
I'd think offhand that the women would have the better case, since, by the typical anatomical standards, the preponderance of evidence is that he/her is a he not a her. Still, on the theory that it's better to avoid inviting any more of the zillions of inmate suits than we have now, let me float a solution:
Build Private Manning his/her own cell, removed from the prison proper, and insert the roommate pictured after the break, a recent international celebrity of sorts who also appears to be of indeterminate gender. This has the added benefit of being the roommate Private Manning has earned. (Caution: the picture is pretty gross).