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The first operations from the airfield began at the beginning of April 1943 , soon after its construction by Army Engineers when the 111th Observation Squadron ( Medium ) of the 68th Observation Group began flying A-20 Havoc reconnaissance and photographic observation missions .
 organization: 111th Observation Squadron; organization: 68th Observation Group
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: 111th Observation Squadron, 68th Observation Group 
Answer:
 organization: 111th Observation Squadron; organization: 68th Observation Group