After an exhausting session with Victoria's Secret Police, Cub Driver
confessed the following:

I believe the max for any aircraft is 250 knots.

The restriction is lifted in certain cases, for example: military jets
doing a Missing Man at Arlington National Cemetery.

Mil jets are not limited to 250 KIAS "due to operational need," as in
a routine Dash 1 procedure (eg 350 KIAS up Initial for the RF-101, 300
KIAS for the F-4, F-16, F-15). But in the radar traffic pattern we
held it down to 250 KIAS.

But Roger's question has to do with the physical limitation of the 757
not something written in an FAR.

Robey