They've gotten away from foaming the runways over the last decade or so.
Dunno if it has to do with cost per gallon, difficulty of cleanup for aircraft arriving afterwards, crash trucks slipping all over the place, EPA concerns, whatever.
We had a nose gear problem on the WC-135 once, no down and locked indicator, and when executing the boldface checklist we discussed the foam issue or lack thereof.
We ended up flying by the tower, and the ATC folks verified gear down for us.
Discussion regarding foam here:
http://www.airliners.net/aviation-forums/tech_ops/read.main/324486/