Please answer the following question: USNS Robert D. Conrad (T-AGOR-3) - USNS Robert D. Conrad (T-AGOR-3) was a Robert D. Conrad-class oceanographic research ship that served the U.S. Navy from 1962 to 1989. During that period while operated by Columbia University -- she provided valuable ocean-bottom information and underwater test data to the U.S. Navy and other U.S. agencies. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Mean Of Transportation