Rapid reaction forces are designed to intervene quickly as a spearhead to gain and hold ground in quickly unfolding combat or in rather low intensity conflicts, such as uprisings that necessitate the evacuation of foreign embassies. Because they are usually transported by air, such military units are usually lightly armed, but often extremely well trained to compensate for their limited to small arms and light crew-served weapons and the lack of vehicles, armor and heavy equipment like tanks.