The Military of Nicaragua's military ranks are shown here in this article. These were adopted in 2010 replacing the Cuba style ranks and their respective insignia that were used for a long time, and are based on the old ranks of the pre-1979 National Guard while general and flag officer insignia mirror the Sandinista practice post-1979. But for the first time, US style warrant officer rank insignia are now included.
Nicaragua military ranks Wikipedia
Privates wear no insignia at all.