Naval Ship's Various Conditions of Readiness and Their Purpose

Condition I - General Quarters
All hands are at battle stations.

Condition II - Modified General Quarters
Used on large ships to permit some relaxation among personnel.

Condition III - Wartime Cruising
Generally one third of the crew is on watch, and strategic battle
stations are manned or partially manned (e.g. weapons). During my time,
this was the normal underway condition of readiness.

Condition IV - Optimum Peacetime Cruising
Provides adequate watch manning, and provides personnel economy.
It is the normal peacetime cruising condition.

Condition V - Not normally a condition, in port routine.