Why don't soldiers wear a totally bullet proof suit which would cover from head to feet?
First off, if you wear totally bullet proof suit which would cover you from head to feet, it may save you from a rifle or a pistol, but it won't certainly save you from this:and definitely not this:also, most body armour is fire resistant, but not fire proof, and I can bet you all my money from my piggy bank which isn't even a pig but a tiger, that body armour, even the most advanced versions, would not save you from a military flame thrower.Current body armour is also usually made from two types of materials called Kevlar and ceramics. Once the ceramics have been hit, the vest becomes mostly useless very rapidly. Kevlar doesn't usually have that problem, but it can't stop anything better than a standard gun with any real success.If full body armour were a thing, you'd be running around in a combat situation with several hundred pounds of extra gear that became useless after the first time you were hit with a 7.62 (the AK47, which is the most common rifle in the world, is 7.62) This body armour would just be a terrible waste of resources and weight.Soldiers need to minimise their carry weight, especially in combat. The gear they wear already weighs around 80 pounds, adding to that would reduce combat efficiency, and make them easy targets for snipers and such.So in other words, like the many people who already answered this question, the two main reasons soldiers around the world don't wear armour like that of the star wars stormtroopers or the video game fallout 4 power armour is because it is heavy, and doesn't really protect the soldier that much from explosions our flamethrowers, or any other type of weapons apart from rifles.