Instead of a tree (as used by Hizbullah), the army seems to use its logo as a kind of schema to portray some of its combatants that died during the recent battles.
The concept of doing skeletons of martyrs if I may call it this way has the peculiar effect of constructing collective imaginaries (nationalism, etc.) around the crystallization of the militant deeds of these actors for the sake of the common cause.
Of course it does not mean that the army has exactly that in mind when doing it. It just signals how modes of expression travel well, and are empowered (given meaning) at various points in time. And here as this liner suggest (Lebanon triumphs thanks to the union of its army), martyrdom helps to create the idea that the Lebanese army is a living organism on its own feeding on the memory of those who died, strengthening the image of a unified institution, an image mirroring the projected dream of a nation.
By the way, I was at the Arabic book forum a couple of days ago, and saw that the Internal Security Forces had their own stand there, selling a huge book full of pictures about (and detailed account of), the ISF’s martyrs from the creation of this institution (before the independence and creation of the Lebanese state, during the French mandate) to this very day practically. It made sure to include the last year.