Here are the service emblems for the two armed services of the United Earth Alliance in my sci-fi.
The idea is that the United Earth Navy is the space force, and the United Earth Legion is the marine/paratroop/army force.
For those of you without Latin, the service mottos are as follows: Navy: Domini Caeli Victi = Masters of the conquered sky Legion: Per Caelum Per Terram = By sky and by land
I tried to go for a basic yet distinct feel for each, both clearly derived from the Alliance emblem.
Thanks. Yes, there is. Beyond just differentiating the two insignia, they represent the 'direction' each service attacks in, in the sense that the Navy has an orbit-to-surface role (i.e. can among other things, bombard planets), whereas the Legion has a surface-to-orbit role (i.e. can among other things, defend a planet's orbital space).