This dragon fountain pen is in a traditional Chinese style and is perfect for your PTO impression. Such a pen would have been a private purchase item, either for the soldier himself or as a souvenir to send home.
Throughout the war and occupation, GI troops were happy to support the local economy abroad, purchasing everything from theater-made uniforms and patches to souvenir gifts. Gifts from the orient included sandals, silk scarves, kimonos, and even fancy chopsticks. Soldiers would buy souvenier silk jackets embroidered with tigers and birds, while sailors would simply send their dress blues to have dragons and mermaids embroidered inside their cuffs and collars
The pens are refillable. Place the tip of the fountain pen in ink and fill the chamber by lifting the syringe (most models use a twist-action, vs. a pull action). Repeat 2 or 3 times until the ink chamber is filled.