777
Development and design In early 1916 , the British War Office drew up a specification for a multi-seat escort fighter to be powered by one of the new Rolls-Royce Eagle engines , intended to protect formations of bombers from German fighters such as the Fokker E.I , with an additional role of destroying enemy airship s. While the specification did not require high speed , a good field of fire for its guns was essential , while the secondary anti-Zeppelin role demanded an endurance of at least seven hours .
 organization: War Office
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: War Office