That is odd.
Odd? How so? Tanks are purchased in mass quantities and built on assembly lines; the M1A1's design has been effectively fixed for a decade. Aircraft like the GH are virtually hand-made in ones and twos, and their sensors are a working definition of the term "state of the art." Tanks can do good work, but only when they know where to shoot...systems like GH are force multipliers that can make a regiment of M1s worth a division of T-72s.