(1) They had radios and could have used them more often and more effectively.
(2) They would have beefed up the sniper program with a lot more trained snipers in the field vs. a limited number of marksman.
(3) Armor would have included better guns that were available to US military but which they failed to implement.
In WW2 one guy was responsible for taking out an entire panzer division. How did he do it? With a radio calling in artillery strikes on the enemy. This is the basis for US military doctrine today. To many WW2 US infantry charged into a situation and fought out of them with guns blazing. Modern tactics would have put higher priority on spotting enemy targets and calling in artillery and air strikes on that target before engaging in direct combat. By the time infantry engaged the enemy it would be from better positions and mopping up what was left over if anything was left over. 347
The infantry would also not engage until the area was well scoped and snipers had eyes on the target.
Give credit to the Soviets for implementing snipers much better than anyone else. Once again, instead of having regular infantry engage the enemy, modern military tacticians would first use snipers to pick off key vantage points prior to sending regular infantry in. Regular infantry would then have snipers keeping close eye on the periphery for them while they advanced into areas.
While spotting, targeting, and calling in strikes seems slower than rushing in, it would actually proved faster as infantry would face less opposition as they advanced. To often US infantry got bogged down in gunfights with enemy forces that could have been eliminated with calling in both air strikes and artillery strikes after spotters identified the targets. With a radio, you can let the artillery shells and bombs from air planes do the job while infantry protect those calling in the strikes.
Also, snipers in both urban and rural settings proved very effective for the Russians and proves very effective for modern military forces today in both settings. Guys in a pill box are easy targets for snipers who could take them out prior to sending in infantry. Spotters with high power optics available at the time could have identified targets and areas of resistance prior to sending guys in. 347