Watch Abrams tanks in armored -vehicle-launched bridge AVLB M60A1 US on the battlefield.onlinbr US M60A1 AVLB ( Armored Vehicle-Launched Bridge) used during US Soldiers training at Fort McCoy.br br br Armored vehicle-launched bridge, abbreviated AVLB is an armored vehicle used to facilitate the passage of other vehicles through rivers, streams or ditches.br br There are models with segments bridge folding or retractable , and that use hydraulic equipment in both cases to reach their final position. Thus the passage is allowed to other vehicles on impassable obstacles for its depth or width.br br The main use is the military . Its great advantage is the quick construction of the bridge, but its disadvantage is that camouflages with difficulty, since the folding segments raise a height of 10 meters, which means that it can be sighted in the distance. That is why many models bridge segments slide horizontally rather than folded.br br These vehicles, designed to assist the transport of infantry to the battlefield, are shielded, although less so than the tanks , equipped with machine guns , mortars or anti-tank missiles .