You're able to change your nickname without loosing progress of your solider. Simply copy-and-paste this format, answer it, then wait patiently for one of our staff members to reply.

Code:

[font=Trebuchet MS][i]Your current ingame nickname: [/i]
[i]Your new nickname: [/i]
[i]Reason (optional; for a blank reason, use N/A: [/i]
[i]Cite evidence that you own this account: [/i][/font]