So I had my SdKfz 251 drop my Anti-Tank squad at a strategic, elevated position in an attempt to stem an onslaught of Shermans. Then I placed the half-track in OpFire to support/cover the AT squad. Now I haven't played many scenarios with half-tracks, so I thought to myself: "Hmmm.... Weren't these mounted with MG-42's or 34's? Doesn't the half-track have the same Range and Firepower as an MG Crew...? Shouldn't the half-track qualify for Rapid OpFire? " Without digging through the rulebook, my opponent and I concluded that it made sense.
After game I decided to see if the rules addressed this matter (directly) or at least supported or prohibited our decision. I've deduced that the rules, by not identifying this ability for half-tracks (p. 40) does not allow for half-track-rapid-opfire (even though the multiple-attack-op-fire rules on p. 32 imply that units other than MG crews may have this capability).
This left me with the question, Why not? Why are half-tracks (mounted with MG's) not given the Rapid OpFire capability? Perhaps there is a sound historical/tactical reasons...?