Japanese Items Help...What Do I Have??

[Devincu]

I found these badges and paper at a local estate sale. I know the vet served in the PTO during WWII and was also in the US Army during the Korean War. Can anyone tell me what I have here? I am not familiar with Japanese or Korean items.
Sorry about the photo quality.
Thank you,
Devin

[Devincu]

Japapnese

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[Devincu]

Japapnese

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[GHP]

Booklet Title:
郵便貯金通帳
Yūbin chokin tsūchō
Postal savings passbook

Subtitle:
岡山貯金支局
Okayama chokin shikyoku
Okayama Savings Branch Office

Inked-in name:
山影博
Yamakage Hiroshi

Wings dated 1940 on reverse; might be civil anti-aircraft badge? Looks like a winged cannon to me.
昭和十五年
Shōwa jū go-nen
1940

Rooster: Korean Judo Participation Medal:
Front:
Too fuzzy to read (and it's ancient seal-script)

Reverse
Large center kanji:
優賞
Yūshō
Victory

Around the periphery I can make out:
朝鮮柔道奬*會
Chōsen Jūdō ? * Kai
Korean Jūdō ?? Association


--Guy

[Devincu]

Booklet Title:
郵便貯金通帳
Yūbin chokin tsūchō
Postal savings passbook

Subtitle:
岡山貯金支局
Okayama chokin shikyoku
Okayama Savings Branch Office

Inked-in name:
山影博
Yamakage Hiroshi

Wings dated 1940 on reverse; might be civil anti-aircraft badge? Looks like a winged cannon to me.
昭和十五年
Shōwa jū go-nen
1940

Rooster: Korean Judo Participation Medal:
Front:
Too fuzzy to read (and it's ancient seal-script)

Reverse
Large center kanji:
優賞
Yūshō
Victory

Around the periphery I can make out:
朝鮮柔道奬*會
Chōsen Jūdō ? * Kai
Korean Jūdō ?? Association


--Guy

Guy,
Thank you very much for taking the time to help with this. Very useful information!

Devin