At Gimli's comment, the Elf promptly turned bright red. Aragorn had kissed him in front of the entire army! The other Elves would probably think he was trying to make a good impression on their Human commander using his looks.
The Prince knew that in order to fulfill his duties as spy, he would need to gain access to privileged information.
The only way to do so would be to get elected as a squadron leader who would be included in all tactical meetings concerning the affairs of the new joint army. The selection of squadron leader was a two-step process.