Warfare since 1945 has bee n dominated by rapid advances in milit ary techn ology. Weapon s of all types have becom e more powerful , flexible, and capa ble of inflict ing huge casualti es. Aircraft, for exa mple, can fly farth er , faste r, carry a grea te r varie ty of weapons, and hit a target with greate r accura cy than eve r before. The introduction of smart technology is in the process of revolutioni zing militar y weapons, and will continue to do so. However , modern equipme nt is hugely expensive and pron e to mechanical failure; few countries can fina nce fully mod ern armies, and those that do spe nd great sums keep ing their weap ons in servicea ble order.