50 CFR §218.66

1. (a)To incidentally take marine mammals pursuant to the regulations in this subpart, the USAF must apply for and obtain an LOA in accordance with § 216.106 of this subchapter.
2. (b)An LOA, unless suspended or revoked, may be effective seven years from the date of issuance.
3. (c)Except for changes made pursuant to the adaptive management provision of § 218.67(b)(1), in the event of projected changes to the activity or to mitigation, monitoring, or reporting required by an LOA issued under this subpart, the USAF must apply for and obtain a modification of the LOA as described in § 218.67.
4. (d)Each LOA will set forth:
   1. (1)Permissible methods of incidental taking;
   2. (2)Geographic areas for incidental taking;
   3. (3)Means of effecting the least practicable adverse impact (i.e., mitigation) on the species or stocks of marine mammals and their habitat; and
   4. (4)Requirements for monitoring and reporting.
5. (e)Issuance of the LOA(s) must be based on a determination that the level of taking is consistent with the findings made for the total taking allowable under the regulations in this subpart.
6. (f)Notice of issuance or denial of the LOA(s) will be published in the Federal Register within 30 days of a determination.