51.   In the thick, jungle-cloaked terrain of the Cenepa River basin, helicopters are of limited use.

52.   It certainly did not help that news helicopters were over the area in pitch darkness early Wednesday morning, rousing many people from bed.

53.   Instead, the helicopters are dark blue.

54.   It operates a Moscow branch headquarters, and a Russian-made helicopter was among cult properties discovered in Shizuoka.

55.   It was the same day in which two US helicopters were hit by al Qaeda or Taliban fire, killing seven US soldiers.

56.   Last month, when his helicopter was about to touch down in the northern state of Bolivar, gunfire rang out.

57.   Lawrence S. Steeler, the deputy superintendent, said that on some summer days there are helicopters from dawn to dusk, sometimes too close to comfort.

58.   Later, when a commander decided he wanted to join his forces for the engagement, there was no helicopter to take him.

59.   Low-flying helicopters are extremely vulnerable to attack.

60.   Noble said that Egyptian helicopters were prepared to pick up Piccard and Jones and that their gondola might be retrieved by truck.