This post shows how to append the USSC logo to ggplot2 graphs.

library('tidyverse')
library('ussc')
# set up the ggplot2 object
p1 <- ggplot(mtcars) +
  geom_point(aes(mpg, disp, color = cyl), show.legend = FALSE) +
  facet_grid(~cyl) +
  scale_colour_ussc(discrete = FALSE) +
  labs(title = "Halis",
       caption = "AbcXyz") +
  theme_ussc()

Overlay the logo as follows:

plot_ussc_logo(p1, "top-right")

plot_ussc_logo(p1, "bottom-center")