The value of that money is the continued global class oppression by the international financial bourgeoisie, and the US-lead western hegemony.
The Afghanistan stalemate served several purposes as I see it.
1) To funnel money to the military industrial complex.
2) To contain China's Belt and Road initiative.
3) To maintain an active military presence in oil producing regions in order to dominate and control trade and to ensure supply (same for Iraq and Libya).