T-Rex: Sometimes in war you want your enemy to think you have way more guns than you actually have! The solution is obvious:
T-Rex: FAKE GUNS.
T-Rex: This has a long tradition! "Quaker Guns" were big ol' logs painted black to pass as cannons, once famously inducing a surrender from the beseiged opponent without a single shot having been fired! And during WWII the Allies built inflatable tanks, NOT JUST FOR FUNSIES, but also to disguise the actual location of the Normandy Invasion by having "tanks" moved to a decoy spot!
T-Rex: Dummy tanks are STILL used, but now generate a fake heat signature too!
Utahraptor: Neat!
T-Rex: And tanks sometimes carry their OWN decoys, so if they need to escape they can set up a fake!
Utahraptor: Just like the HoloDuke in Duke Nukem 3D!
T-Rex: Hah hah! That game is 20 years old! To get that reference you have to be real old too!
Utahraptor: Hah hah hah!!
T-Rex: Oh noooooooo