On back of card, Army Transport USS Maricu - life on board - nothing to do. I can not find any information on this ship. Is it WWI or WWII?
The reverse of the card is shown below:
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Postcards produced on Kodak Professional AZO paper had 'AZO stamp boxes' on the reverse. The style of these boxes varied over time.
In this case, we have four triangles in the corners of the stamp box, two 'up' and two 'down'. This suggests that the card was produced in the date-range 1918-1930.
The ship name on the reverse appears to be 'USS Marica'. A search for the USS Marica found another image of this card, with the caption:
Sea sick Soldiers on the ship's deck, while they were en route home from France in mid-1919.
The original image is printed on post card ("AZO") stock.
which matches the dating from the AZO stamp box.