That's what an effect of the U.S. military's policy of preparing to fight the last combat action, police action, or whatever.
IIRC, H. Norman Schwarzkopf wrote something about in his book (I highly recommend it by the way), because for GW 1, they had to replace a lot of the jungle equipment with desert eqipment.
After GW 1, the U.S. military focused on a preparing for a short high intensity conflict. You can see that approach worked for March and April.
After this unpleasantness, the military is going to be gearing toward a long drawn out relatively low intensity occupation in primarily an urban and desert environment.
The next war will probably be a lot different.
Repeat ad infinitum.