[lhm]

Not evidence, but the product page indicates:

"In addition to supporting portable, consumer, industrial, communications and medical applications with commercial and industrial temperature devices, Actel also offers ProASIC3 FPGAs with specialized screening for automotive and military systems."

http://www.actel.com/products/pa3/

There seems to be a special variant of the chip for military use, hopefully without this 'debugging feature'.

[cnvogel]

"Specialized screening for automotive and military systems" means that they have done more extensive tests on otherwise identical chips.

As an example: for military chips they will certainly do every (non-destructive) test they know on every single device, say at elevated temperature with a little less than the minimum specified operating voltage... The test-devices themselves might cost $1M and be occuplied for oen hour per chip, hence they will charge you more for the final chip.