with artillery and destroy enemy vehicles and troops.
I hope the following Bolded paragraph is NOT true. Otherwise, I would question the intelligence of US military officer corps.
Then a Ukrainian officer arrived and revealed that the enemy would have drones as well. That means both sides could see what the other side was up to. The Ukrainian visitor pointed out that everyone was constantly in danger of a drone attack in Ukraine. The Americans would have to work harder to prepare themselves for that.
Anyway onward to cancelled US military weapon system due to drone technology.
Orders for the M-10 Booker, a tank-like vehicle described as an assault gun, were cancelled. Same situation with the JLTV or Joint Light Tactical Vehicle. This was a seven ton armored vehicle that could protect the troops it was carrying from mines and roadside bombs. JLTV was very vulnerable to drone attacks. The army had 50,000 JLTVs on order but has cut that to 18,000. This is the number that have already been produced or are in the process of being built.
Instead the army has ordered more of the new Infantry Squad Vehicle. This is similar to a dune buggy and consists of nine seats, some roll bars and an engine. This vehicle depends on speed and maneuverability to keep the troops safe.
The following Bolded paragraph leads me to believe that the US military is slooow to adapt.
Many American soldiers have purchased consumer grade quadcopters and adapted them for combat use. The troops practice with these quadcopters and acquire skills and experiences similar to what their Ukrainian counterparts are undergoing in combat.