Do modern day soldiers always carry the 100 to 120 lbs of stuff - P-vest, weapons, ammo, radios, ruck, extra ammo into the fight?

One of the things we did during my tenure (early 70s to early 90s) was we would cache, under security, our rucks before moving to a recon area, ambush site or attack objective. We carried on our bodys only our fighting gear to the fight. Total weight was between 30 and 40 pounds.
We had the old flak jackets but they were something we wore in the vehicles. The majority of the Scout Sgts I knew left them in the rear - we didn't ever wear steelpots or flak jackets on patrols, because we would break contact if compromised.
Do you not do that now? If not maybe a re-look at that technique.