Combat knives are made specifically for military personal to use in hand to hand combat. Their secondary uses include chopping thick wood and underbrush in order to clear paths for soldiers.
There are many practical uses for combat knives besides the obvious- the use by the military for hand-to-hand combat. One of the more practical uses for combat knives are cutting ropes and/or lines.
It depends on your rate/rank, but yes, the Navy does issue knives, be it seamanship/utility knives or combat knives (SEAL's, SeaBee's).
Knives are not an issue item. You want one, you supply your own.
A trench knife is distinguished from other types of knives because a trench knife is used for close-quarter fighting. Other knives such as the combat knife is used by soldiers in the field, but is also used for fighting.
They were used for hand to hand combat if the enemy jumped into their trenches. This was the first war with extensive use of trench warfare.
A tactical knife is a knife that is (or supposed to be) suitable for combat, but is also designed such that it can be used for utility purposes as well. Pure combat knives don't really have much of a use anymore.
Spear, sword, dagger by the armoured warriors, an javelins, bows, knives and rocks by their serf light infantry.
Some weapons the British used in The Battle of Saratoga is...guns, muskets, knives, and kinds of weapons todays date still uses in the the wars and battles of out countries.
Santoku knives are versatile Japanese knives used for slicing, dicing, and chopping a variety of ingredients in the kitchen.
The Busse company provide retail services. They sell performance and combat knives. One can purchase the knives from their website or from the online auction site eBay.
The same as it has been since time began. Any time you are close enough to physically touch your enemy you are in hand to hand combat. Fists, knives and bayonets, even rocks and rifles are used to hit your enemy.
Knives were used often in World War 2 for knocking off the enemy quietly, especially at night, so as not to advertise one's presence or position with something noisy like gunfire or grenades. Knives were also carried for hand-to-hand combat, as they were not subject to jamming or expenditure of ammo like firearms, and they were sometimes a soldier's last hope for survival. The British Sykes-Fairbairn commando dagger and the US Marine Ka-Bar are two of the more famous World War 2 combat knives, but there were many others. The Gurkha regiments were also infamous for their use of the khukri, a large knife well-suited for hacking and stabbing.