Haven't checked if it's like that in the sim, but (from Wikipedia):
'Once the aircraft had dropped their bombs, they were to execute what SAC termed "post-target turns" (PTT) to the west. These turns had two unfortunate consequences for the bombers: the B-52s would be turning into a strong headwind, slowing their ground speed by 100 knots (185 km/h) and prolonging their stay in the target area and the PTT would point the emitter antennas of their EW systems away from the radars they were attempting to jam, degrading the effectiveness of the cells, as well as showing the largest radar cross-section to the missile guidance radars.'
On 19th December, if I'm not mistaken, they turn E.
PTT is performed by the B52 targets of the Hanoi scenario of the SIM.
The reason of the B52 kills were rather in the use of the T/T method, not related to the PTT.
The B52's were hit well before the PTT, not while performing it. (it is much easier to track a straight flying target, than a turning one)
