However , the time and resources to carry out such luxurious preparations are not always there . Not every attacker can field an overwhelming force of specially trained and equipped men with reinforcements standing by . Information about the inside of an enemy-held building or vehicle may not be accessible beyond studying it through binoculars or a rifle scope . While some attackers can go to the lengths of wearing the enemy down by siege or even tunnelling under them , others must get the current job done immediately with the force available in order to move on to the next
tunnelling under them
Japanese embassy hostage crisis
Close quarters combat