Vehicle Maintenance alone...
[...]
"...SIGAR found that capacity-building issues endemic to the ANA have contributed to the failure to create an organic Afghan vehicle maintenance capacity. While AISS used AMTs to train the ANA on vehicle maintenance, challenges, such as a low literacy rate in the ANA, poor training attendance, low retention of trained ANA personnel, and a limited pool of ANA managers who possess the skills necessary to manage the supply chain and maintenance shops hindered AISS’s efforts."
[...]
"CONCLUSION
The failure of AISS to meet its most basic contract requirements and program objectives, and DOD’s inaction to correct contractor deficiencies and seek repayment of funds, has resulted in not only the waste of U.S. taxpayer funds but in the need for a new maintenance contract that is projected to cost more than $1 billion over the next 5 years"
[...]
(from this document - 28 page PDF)
https://www.sigar.mil/pdf/audits/SIGAR-16-49-AR.pdf
Of course the contract will probably have modifications and changes over the next 5 years, causing the amount to increase.
And, if you have the time, here's a decent good book about similar shenanigans in Iraq:
https://www.amazon.com/We-Meant-Well-American-Project-ebook/dp/B004ULOJA2/ref=sr_1_1?s=books&ie=UTF8&qid=1473861528&sr=1-1&keywords=we+meant+well#nav-subnav
"...SIGAR found that capacity-building issues endemic to the ANA have contributed to the failure to create an organic Afghan vehicle maintenance capacity. While AISS used AMTs to train the ANA on vehicle maintenance, challenges, such as a low literacy rate in the ANA, poor training attendance, low retention of trained ANA personnel, and a limited pool of ANA managers who possess the skills necessary to manage the supply chain and maintenance shops hindered AISS’s efforts."
[...]
"CONCLUSION
The failure of AISS to meet its most basic contract requirements and program objectives, and DOD’s inaction to correct contractor deficiencies and seek repayment of funds, has resulted in not only the waste of U.S. taxpayer funds but in the need for a new maintenance contract that is projected to cost more than $1 billion over the next 5 years"
[...]
(from this document - 28 page PDF)
https://www.sigar.mil/pdf/audits/SIGAR-16-49-AR.pdf
Of course the contract will probably have modifications and changes over the next 5 years, causing the amount to increase.
And, if you have the time, here's a decent good book about similar shenanigans in Iraq:
https://www.amazon.com/We-Meant-Well-American-Project-ebook/dp/B004ULOJA2/ref=sr_1_1?s=books&ie=UTF8&qid=1473861528&sr=1-1&keywords=we+meant+well#nav-subnav