MSO 489 is the hull number of a now-decomissioned USN minesweeper on which I served. MSO means minesweeper ocean-going. I was aboard for most of 1970. I joined the ship in Subic Bay, Philippines, and went on two prolonged patrols in the DMZ (demilitarized zone, but don't count on it). Eventually, we sailed back across the Pacific with a prolonged stint for repairs on Guam. I was eventually reassigned to Midway Island where I did a newspaper, and on to Milwaukee Navy Recruiting for some months before separation two months early to begin graduate school, since the military was scaling down. On the 'sweep, I was a radioman, after that, a journalist, a rare change of job assignment done in response to a special program from the Chief of Naval Operations. The ship hull was all-wood construction, Washington Spruce, and powered by four Packard diesel engines (yes, that Packard, the old car-maker). I thought I was getting my military obligation out of the way, but of course, when you spend a chunk of your twenties in the service, it tends to shape your life ever after.
I say the ship was decommissioned, but it was given to the Taiwanese navy and is likely still in service, refitted with Japanese diesels. It was very well built in Tacoma in the mid-1950s. It is renamed.