The collar tabs show him to be a LTJG. The flower emblems below his sleeve stripes were used to show officers commissioned from the enlisted ranks, as seen here:hisashi wrote:2. Navy officer with family:
Taken in 28 Jun 1942
from right
Yamada Kesayoshi?
Kikuko 11 years old
Akira 13 years old
Hasuko
Lines on his sleeve hard to see but perhaps he was a Sub Lt. A line officer was usually offered a marrige at 1st/Sub Lt. or army Capt./navy Lt. He looks young and Hatsuko's eye and bree resemble those of Kesayoshi, so the others might be his younger brothers/sisters.
Usually these personnel never rose higher than a full LT.