Question: The RL-83 Blindicide was produced by Mecar SA of Belgium and was an improved derivative of what man-portable recoilless anti-tank rocket launcher weapon, widely fielded by the United States Army?

Context paragraphs:
RPG-22: The Soviet RPG-22 "Netto" is a one-shot disposable anti-tank rocket launcher first deployed in 1985, based on the RPG-18 rocket launcher, but firing a larger 72.5 mm fin stabilised projectile.  The weapon fires an unguided projectile, can be prepared to fire in around 10 seconds, and can penetrate 400 mm of armour, 1.2 metres of brick or 1 metre of reinforced concrete.

Technical (vehicle): Technical is a neologism for a light improvised fighting vehicle, typically an open-backed civilian pickup truck or four-wheel drive vehicle mounting a machine gun, anti-aircraft gun, rotary cannon, anti-tank weapon, anti-tank gun, ATGM, mortar, multiple rocket launcher, recoilless rifle or other support weapon, somewhat like a light military gun truck.

Clarence N. Hickman: Clarence Nichols Hickman (August 16, 1889 – May 7, 1981) was a physicist who worked on rockets with Robert Goddard.  He is known for developing the bazooka man-portable recoilless antitank rocket launcher weapon, and the American Piano Company Model B player piano.  He is also known as the "Father of Scientific Archery".

Bazooka: Bazooka is the common name for a man-portable recoilless anti-tank rocket launcher weapon, widely fielded by the United States Army.  Also referred to as the "Stovepipe", the innovative bazooka was among the first generation of rocket-propelled anti-tank weapons used in infantry combat.  Featuring a solid-propellant rocket for propulsion, it allowed for high-explosive anti-tank (HEAT) warheads to be delivered against armored vehicles, machine gun nests, and fortified bunkers at ranges beyond that of a standard thrown grenade or mine.  The universally-applied nickname arose from the M1 variant's vague resemblance to the musical instrument called a "bazooka" invented and popularized by 1930s U.S. comedian Bob Burns.

M90 Stršljen: The RBR-120 mm M90 (nicknamed "Стршљен" or "Stršljen", meaning "Hornet") is a light-weight, single-use, unguided anti-tank rocket launcher.  The launcher is produced by Eurokompozit of Prilep, Macedonia, while the anti-tank rocket is produced by Sloboda Čačak, Serbia.  It is intended for use against tanks and other armored vehicles in addition to fortifications and infantry.

Alcotán-100: Alcotán-100 is a recoilless, one-man portable, single-use anti-tank rocket launcher used by infantry, manufactured by Instalaza.  It is in service with the Spanish Military, where it is gradually replacing the C-90.

LRAC F1: The LRAC F1, officially called "Lance-Roquettes AntiChar de 89 mm modèle F1" (89 mm anti-tank rocket launcher model F1) is a French reusable rocket launcher developed by Luchaire Défense SA, and manufactured in cooperation with Manufacture Nationale d'Armes de Saint-Étienne and was in the 1970s marketed by Hotchkiss-Brandt.  It replaced the 89 mm M20A1 Super Bazooka in French Army service.  Through the use of fiberglass and plastic in the launcher it is over 2 kg lighter when loaded than the M20A1 while having a greater effective range.  The LRAC FI is sometimes referred to as the STRIM 89mm antitank rocket launcher from the abbreviations for the private firm "Société technique de recherches en industries mécaniques" that was contracted in 1964 by the French Ministry of Defence, to research a replacement for the M20A1 Super Bazooka.  In the early 1970s, two antitank weapons were placed in production for evaluation by the French Army to replace the M20A1: the 80mm ACL-APX, a recoilless cannon with a rocket assist projectile, and the 89mm LRAC F1 STRIM 89mm rocket launcher.  The STRIM design was chosen as the replacement for the M20A1 based on its higher penetration ability of its antitank ammunition and the much lower over all manufacturing costs compared to the 80mm ACL-APX system.

RL-83 Blindicide: The RL-83 Blindicide is primarily an antitank rocket launcher but other rounds could be fired.  It was produced by Mecar SA of Belgium and was an improved derivative of the M20A1 Bazooka.  Its name roughly means "tank killer", derived from the French "véhicule blindé" ("armoured car") and the suffix "-cide".

Carl Gustaf recoilless rifle: The Carl Gustaf (] ; also known as, Gustaf Bazooka and M2CG) is an 84 mm man-portable reusable anti-tank recoilless rifle produced by Saab Bofors Dynamics (formerly Bofors Anti-Armour AB) in Sweden.  Although most rounds fired by the Carl Gustaf work on the classic recoilless principle, modern rounds sometimes add a post-firing booster that technically make it a rocket launcher.

PF-89: The PF-89 is the new generation standard light anti-tank weapon (LAW) in service with the People's Liberation Army (PLA) to replace the obsolete Type 69 RPG.  It is a rocket launcher used primarily by infantry squads to engage and defeat light armor and bunkers.  The recoilless design permits accurate delivery of an 80mm High Explosive Anti-Tank warhead, with negligible recoil.  PF-89 entered mass production in 1993.

Supporting paragraphs: RL-83 Blindicide Bazooka
Answer: Bazooka