Sentence:  The connective system , or network , is tailored to meet the requirements of the objective , and it <WSD>is</WSD> therefore not surprising that a military body acting as a single coordinated unit has a different communication network than a factory , a college , or a rural village . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)