Amends 10 U.S.C. 723(a) by striking specified text.

Amends the heading for section 723 of title 10 by striking specified text.

Amends the table of sections at the beginning of title 10 by striking the item relating to section 723 and inserting a new item referencing chapter 41.

Adds new section 990 to chapter 49 of title 10, creating a prohibition on simultaneous service in the Department of Defense and civilian law enforcement, with exceptions for specified reserve component members and a recusal requirement when such members are called to active duty.

Adds a new section 274a to Title 10 creating limits on Department of Defense support to civilian law enforcement: requires the President to submit to Congress a notification and written justification containing specified information before the Secretary of Defense may provide support under 10 U.S.C. §§272–274; limits provision of such support to 30 days unless Congress enacts a specified 'joint resolution of approval' for a longer period; defines the form and content of such a joint resolution and prescribes expedited procedures for introduction, referral, committee reporting/discharge, floor consideration, vote threshold in the Senate, and limitations on debate of veto messages.

Section 272 is amended by inserting additional text (the bill states 'is amended by inserting after .' but does not provide the insertion text in this section).

Section 273 is amended by inserting additional text (the bill states 'is amended by inserting after .' but does not provide the insertion text in this section).

Section 274 is amended by inserting additional text after each place it appears and the new section 274a is inserted after section 274; the table of sections for chapter 15 is also amended to add a new item after the item for section 274.