The article says:

financial aid for military purposes

In addition to the military aid detailed in this infographic, the U.S. has also supplied weapons and equipment worth over $5 billion.

No idea what this all means. $46bn worth of weapons that never make it to the front and instead enter the European black markets? Middle managers and administrative costs? Maybe it subtly recognises that the US overpays by 10:1 for it's weapons, with the $46bn being what the shareholders make above the profit made on $5bn worth of actual weapons? Or it's just playing with the numbers to make it seem like the US is doing loads to 'help'. We could ask the same auditors who lost between $2tn and $22tn or more in the last couple of decades.

But if the real cost is closer to $51bn, including weapons, it makes me wonder how expensive Afghanistan really was.

Edit: added missing words.