Many new weapons were fielded, but one of the most important was the helicopter. It allowed quick air support and troop transport over jungle instead of through it, which brought vulnerability to North ambush.
Nuclear weapons were not used during the Vietnam war
Raytheon's Patriot missile--a ground-to-air defensive missile system employing advanced seeking technology--proved itself as a reliable and effective weapon system.
Japan
Nuclear weapons were not used in the Vietnam War.
In Vietnam the US used Sparrows & Sidewinder air to air missiles. But ultimately the gun (20mm) proved to be a most commonly used weapon; by far by the NVAF MiG 17 & 19s.
Because the poison gas would kill them to
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Keeping up with communist new weapon technology (and they us), and fighting them in Korea and Vietnam.
Effective Weapon - 2013 was released on: USA: 1 August 2013
the highly trained infantryman. any weapon in an untrained Soldiers hands are less effective
The USAF used all of its weapons except for the B47 Stratojet, F106 Delta Dart, and its B57 Hustler. Its most deadly weapon used in the Vietnam War was its B52 Stratofortress.
The term Maximum Effective Range is used to distinguish between Maximum Range (how far a bullet will travel) and the greatest usable range. Maximum Effective range is defined as the greatest distance at which a weapon may be expected to fire accurately to inflict casualties or damage. While cartridges have an approximate range, the true effective range is determined by both the cartridge, and the weapon that fires it.