Hello Gollevainen
OOTW = operations other than war.
Military operations other than war (MOOTW) is a concept in United States military doctrine that refers to the use of military capabilities across a range of operations that fall short of outright war. Military operations other than war focus on deterring war, resolving conflict, promoting peace, and supporting civil authorities in response to domestic crises. MOOTW may involve elements of both combat and non-combat operations in peacetime, conflict, and war situations. MOOTW involving combat, such as peace enforcement, may have many of the same characteristics of war, including active combat operations and employment of most combat capabilities.
Because of political considerations, MOOTW operations normally have more restrictive rules of engagement (ROE) than in war.
MOOTW purposes may include to deter potential aggressors, protect national interests, support the United Nations (UN), or provide humanitarian assistance.
quoted from Wikipedia:
http://en.wikipedia.org/wiki/OOTW