The US may be allowed to return to the Uzbek base of Karshi-Khanabad (K2) soon. They were evicted in 2005 after the massacre in Andijon in May and consequent international criticism. In recent weeks, Washington has spoken with Turkmenistan and Uzbekistan about the possibility of a base, even after arguing that a base was not necessary to supply Afghanistan.
Washington is also looking to work more closely with Azerbaijan. Azeri private companies have agreed to transport an increasing amount of cargo. The military is not involved but may be at some point. After Azerbaijan learned that Russia provided arms to Armenia, Russia has a weaker hand to play.
More than securing a return to the base, the US is looking for much more participation from Turkmenistan and Uzbekistan in supplying Afghanistan.