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Here is the translation of the text on the front and back of the envelope.
Front of Envelope
Red Stamps
Top Left: 軍事郵便 (Military Postal Service)
Bottom Left (Censor/Sender Stamp):
検閲済 (Censored / Inspected)
飛田部隊 (Tobita Unit)
衛生准尉 (Medical Warrant Officer)
堀田市太郎 (Hotta Ichitarō)
Handwritten Text (Right to Left)
Address: 群馬県利根郡池田村中発知 (Nakahotchi, Ikeda Village, Tone District, Gunma Prefecture)
Recipient: 増田 登 様 (Mr. Noboru Masuda)
Back of Envelope
Handwritten Text (Right to Left)
Date: 昭和十三年五月二十九日 (May 29, Showa 13 [1938])
Sender's Military Unit/Address:
北支派遣軍 (North China Expeditionary Army)
乘松部隊氣付 (c/o Norimatsu Unit)
中嶋部隊 石井隊 三小隊 (Nakajima Unit, Ishii Company, 3rd Platoon)
Sender's Name: 吉沢 日出男 (Hideo Yoshizawa)
Letter Translation
Dear Sir,
[The opening lines consist of standard, formal seasonal greetings, inquiring after the recipient's well-being and expressing gratitude for receiving a recent letter or care package (慰問 - imon, a term specifically used for letters/packages sent to comfort soldiers at the front).]
Regarding my own situation, I sustained a minor injury at the front lines and was hospitalized for medical treatment. However, I am pleased to report that I have recently made a complete recovery. I have been formally discharged from the hospital and have successfully rejoined my original unit, so please put your mind at ease.
[The letter concludes with a standard formal closing]
Pardon my hasty penmanship, but I write this in reply to you.
May 30th
Yoshizawa
Mr. Noboru Masuda