; (B) the security of defense critical electric infrastructure; or (C) the security of a military installation, defense site, or critical defense facility. (c) Use of existing fiber infrastructure (1) In general Subject to paragraphs (2) and (3) but notwithstanding any other provision of law, except as otherwise provided expressly in a written easement, with respect to any fiber infrastructure existing and installed as of the date of enactment of this Act (such as fiber infrastructure installed by a grid operator to monitor the operation of the applicable grid or network) on land subject to an easement or right-of-way granted by the Federal Government for the location and use of electric transmission or distribution facilities, the operation, leasing, repairing, and servicing of that fiber infrastructure for broadband or other communications services— (A) shall be deemed to be an allowed use within the scope of the easement or right-of-way; (B) shall not be considered to be a change in the physical use of the easement or right-of-way; (C) shall not be considered to interfere with, impair, or take any vested or other rights of the owner or occupant of the servient estate; (D) shall be considered to impose not more than a de minimis burden on the servient estate; and (E) shall be considered to have value to the owner or occupant of the servient estate in an amount that is greater than any de minimis burden imposed. (2) National security (A) In general Paragraph (1) does not apply to an easement or right-of-way that— (i) is located on a military installation, defense site, or critical defense facility