The lightweight, shoulder-fired, four-tube launcher is equipped with front and rear hinged protective covers. A folding sight and trigger handle assembly provide compact carrying and storage capabilities. An adjustable sling is used to carry the launcher over the shoulder.
The launcher is loaded with a clip (M74), which contains four 66mm rockets. It can fire one to four rockets semi-automatically at a rate of one rocket per second and can be reloaded with a new clip. The basic load for each launcher is three M74 rocket clips
I have found information about this strange weapon, M202 Multi-Short portable flame weapon.
The M202A1 multishot rocket launcher (Flash) is a lightweight, reusable, four-tube rocket launcher. It is half as heavy as the M9A1-7 and M2A1-7 portable flamethrowers, has five times the range against point targets, and requires less servicing and maintenance.
The Flash can be used in both an offensive and defensive role because it is lightweight, has an extended range, and has a minimal maintenance requirement. Due to the weapon's accuracy and the trajectory of the rocket, it can get into areas and enclosures which other weapons cannot enter. It can produce personnel casualties in bunkers, buildings, and covered or open foxholes, as well as damage unarmored vehicles and destroy combustible supplies, ammunition, and materiel.
The M202A1 produces a psychological effect -- the brilliant splash of the bursting warhead makes it an excellent weapon to suppress RPG and Sagger missile firing sites and when fired near armored vehicles, will normally make the crew button-up.
The Flash may be employed like other direct fire weapons with the assault element or with a supporting element as a supporting or covering weapon. The M74 rocket is normally employed by infantry elements in the assault for the same purpose as flamethrowers; however, targets can be engaged at a greater range and with greater accuracy with this weapon than with the portable flamethrowers. Thus, the M202A1 gunner is less vulnerable to enemy fire than flamethrower operators.
Rocket :
Ammunition for the M202A1 rocket launcher is issued in rocket clips of fixed ammunition (the rocket motor propelling charge is not adjustable). The rocket clip consists of four aluminum tubes each preloaded with one 66mm rocket.
Each rocket consists of an M235 warhead, containing approximately 1.34 pounds (0.61 kg) of thickened pyrophoric agent (TPA), an M434 fuze, and an adapter, which adapts an M54 rocket motor to the warhead.
The TPA is triethylaluminum (TEA), a substance similar to white phosphorus, which burns spontaneously when exposed to air at temperatures between 1400-2200 degrees Fahrenheit.
The M434 fuze is a basedetonating (BD), nondelay-action type. It incorporates a graze functioning element which, upon deceleration due to impact, causes the fuze to detonate the burster in the warhead.