Yes but the refueller radios are not DP3400's.. They are Kenwood TK-5320's
As I said earlier, if the channel programmed in the DP is analog, then you will hear the transmission on the scanner. If the channel programmed in the DP is TRBO/TDMA digital then you will not hear it on the scanner.
Now, the Kenwood TK-5320 is an analog / P25 digital two way. The UBCD396XT is capable of receiving both analog and non encrypted Phase 1 P25 transmissions. Assuming the the refuellers are using either analog or non encyrpted Phase 1 P25, you will hear them on the scanner.
No scanner is capable of receiving TRBO/TDMA digital at the moment and for the forseeable future. And while Phase 2 P25 is TDMA, it is not the same as TRBO/TDMA. While they are using the same platform, they are not interchangable.
I hope that clarifys things.