Generate a correct and concise answer for the question based on the words in the context.

Ex Input:
Context : The ESO 3.6 m Telescope is an optical reflecting telescope run by the European Southern Observatory at La Silla Observatory, Chile since 1977, with a clear aperture of about 3.6 metres (140 in) and 8.6 m2 (93 sq ft) area. 
Question : In which year was the service entry date for ESO 3.6 m Telescope?

Ex Output:
1977


Ex Input:
Context : The 18th Mounted Brigade previously known as the 2/1st Yorkshire Mounted Brigade was a 2nd Line yeomanry brigade of the British Army during the First World War. 
Question : To which branch did 18th Mounted Brigade belong?

Ex Output:
British Army


Ex Input:
Context : Charles S. Kendrick (23 January 1817 -- 13 August 1863) was an officer in the United States Navy during the American Civil War. 
Question : What organization was Charles S. Kendrick involved with?

Ex Output:

United States Navy