Sentence:  There were no depressingly serious cases : the ward doctor sometimes teamed up with the chaplain to serve as a marriage counselor - sometimes the Navy sent people back to the States to preserve a marriage - but mental health as a rule <WSD>was</WSD> very high . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)