"ODA" stands for Operational Detachment Alpha - the basic organizational structure of US Army Special Forces. About the size of a large squad or a small platoon, an ODA is more comparable to a Battalion Staff - for that is the organization that it mirrors; the guerrilla battalion command element and staff - Special Forces work intimately with the local people and the "indigenous" forces.
These photos were taken in Firebase Chamkani - established 17 Dec 2004 - sent in anonymously by a member of ODA 3333 - I do not know if he is aware that I once served on that detachment. Judging by the initials, I suspect I know who it is.
Here is a link to an excellent article regarding US Army Special Forces activities in this area, involving detachments from my old outfit; 1st Battalion, 3d Special Forces Group:
US Army Tribal Engagement in Afghanistan
SEAN LINNANE SENDS