Box of rockets

A box of rockets is a large tan box marked with the UAC logo that contains 5 rockets when picked up by the player, which serve as ammo for the rocket launcher. It provides 10 rockets, however, at the I'm Too Young To Die and Nightmare! skill levels.

A direct hit from a rocket inflicts a range of 20 to 160 hit points of damage (determined using Doom's pseudorandom number generator); the explosion may also cause additional blast damage. Rockets fired by cyberdemons do the same amount of damage as those from the player, blast damage included.

Data
In classic Doom, boxes of rockets are first encountered on these levels:

The IWADs contain the following numbers of rocket boxes: