This ebay auction for a HP-71B includes:
"US Forest service Notebook Guide for using HP-71B for calculating Fire behavior".
It also includes four modules, two labeled "SINGAPORE FIRE BEHAVIOR", and two labeled "SINGAPORE FIRE DANGER RATING".This auction for a TI-59 includes a software module labeled "FIRE BEHAVIOR NFDRS".
Both came in a hard case, with matching printers and accessories.
Looks like US National Forest Service used calculators for firefighting, and they contracted custom software development from HP and TI.
Does anyone know anything about it ? It is not quite interesting as the HPs in space, but a very interesting usage of calculators. Must have been replaced by a ruggedized notebook in a hard case - can you imagine a firefighter having to deal with a Windows crash while working at a California forest fire ? Ouch...