This is the 13974th most frequent Russian word.
общевойсковая
"Общевойсковая" means "combined arms" in English.
The word "общевойсковая" is used here as an adjective modifying "подготовка", meaning "general military" to describe the type of training.
Общевойсковая подготовка является ключевым элементом обучения солдата.
General military training is a key element of a soldier's education.
In this sentence, "общевойсковые" modifies "учения", implying exercises that include various aspects of military forces.
На прошлой неделе начались общевойсковые учения.
The general military exercises started last week.
Here, "общевойскового" refers to "назначения" to denote equipment intended for general military purposes.