The 5th Yokosuka Special Naval Landing Force (5th Yokosuka SNLF) were troops of the Imperial Japanese Navy's Special Naval Landing Forces.
Formed at the Yokosuka Naval District, the 5th Yokosuka SNLF participated in the invasion of Buna-Gona and the Guadalcanal Campaign.
References
5th Yokosuka Special Naval Landing Force Wikipedia(Text) CC BY-SA