Weapons

Rifles
The Moriyama of Special Forces Unit 16 used Rifles on vampires. The rifle used was the Type 38 Arisaka Bolt-Action Rifle. (Based on the setting) This bolt-action rifle was very common for any solider in the Japanese Imperial Army. Though not very deadly on vampires, it was still effective enough to support the vampire unit.

Revolvers
Lieutenant General Sonosuke Nakajima carries a Type 26 Nambu Revolver. It was shown in a couple of scenes but was never fired.

Swords
The Katana is used by the Yoshinobu Maeda and Shutaro Kurusu, of Special Forces Unit 16. This was a proven weapon to be deadly on vampires.