32 CFR §842.18

1. (a)How and when to file a claim. A claim is filed when a federal military agency receives from a claimant or duly authorized agent a properly completed AF Form 180, DD Form 1842 or other written and signed demand for a determinable sum of money.
   1. (1)A claim is also filed when a federal military agency receives from a claimant or duly authorized agent an electronic submission, through a Department of Defense claims Web site, indicating that the claimant intends for the appropriate military branch to consider a digitally signed demand for a determinable sum of money.
   2. (2)A claim is also filed when the Air Force receives from a claimant or duly authorized agent an electronic submission, through the Air Force claims Web site, a digitally signed demand for a determinable sum of money.
2. (b)Amending a claim. A claimant may amend a claim at any time prior to the expiration of the statute of limitations by submitting a signed amendment. The settlement authority adjudicates and settles or forwards the amended claim as appropriate.
3. (c)Separate claims. The claimant files a separate claim for each incident which caused a loss. For transportation claims, this means a separate claim for each shipment.