This is the 3505th most frequent Russian word.
ракетной
"Rocket" or "missile-related."
Here, 'ракетной' is used as an adjective describing 'техники' (technology), indicating its association with rockets or rocketry.
На заводе начали производство новой ракетной техники.
A new rocket technology production has started at the factory.
In this sentence, 'ракетной' is an adjective modifying 'системы' (systems), specifying that the systems are related to or intended for rockets.
Инженер проектирует ракетной системы управления.
The engineer is designing rocket control systems.
Here, 'ракетной' describes 'установки' (launcher), indicating it is designed for launching rockets.