Yes it is in many cases. It really depends on the C.O. IRT some qualifications but most qualifications have to be redone at every change of station.

My OOD quals were cancelled as soon as I left one ship and I had to requal on the new ship. Now my "Rules of the Road" ticket was good for 5 years along with my Rapid Radar ticket,, but I wasn't qualified to drive the new ship until the C.O. of that vessel said I was qualified to drive his "toy".