How a tactical knife differs from kitchen knives are that they are smaller, darker, and thicker. Tactical knives often come between 3 and 12 inches.
Konstantine said "The difference between these knives versus other “fighting knives” is that they are field tested. Yes, that crazy shaped knife you seen online that is labeled a combat knife is not really field testing–maybe in the designer’s fantasy." And that is very true for real tactical knives.
The article was written for Soldiers and Marines who want to take their TA50 to the next level. Owning a combat knife is great if you want to cut those thick MRE boxes open, skin a deer, and kill the enemy.
One of the great things about tactical knives is that you can abuse them a lot. People often use them to pry open cans, dig holes, and throwing. The full article can be found here http://bestmachete.net/