SS ARIZONAN was a cargo ship constructed between September 1919 and March 1920 by the Sun Shipbuilding and Dry Dock Company, Chester, PA, originally named CONSHOHOCKEN. In 1921 she was renamed WILLHILO and in 1929 was renamed ARIZONAN. In 1946 she was renamed again to NORTUNA, before being scrapped in 1959. See http://shipbuildinghistory.com/history/shipyards/2large/inactive/sun.htm and scroll to hull number 15.
If you are interested in obtaining photographs of the ships in which your father served, see this web page for sources of photographs of World War II-era merchant ships: http://www.usmm.org/photosource.html. For SAMUEL ASHE and MYRON T. HERRICK, your best bet is Mr. Hultgren, the second source listed, since his collection specializes in Liberty ships. Both ASHE and HERRICK were Liberty ships. I know enough about his collection to say that he apparently has images for both ships. I understand Mr. Hultgren charges $10 each for an 8x10 print. He has no e-mail or Internet access so you will have to send a letter. Mr. Hultgren is quite elderly but at last report was actively managing his collection.
As to ARIZONAN I don't know what source might be best. She was not a Liberty so Mr. Hultgren may not be able to help but no harm in asking. You might also try the Mariners Museum library in Newport News, VA. You might further try each of the names under which she sailed.
Ron Carlson, Webmaster
Armed Guard / Merchant Marine website