(13) Any other critical safety item as determined appropriate by the Secretary. (h) Effective date This section applies with respect to a contract entered into by the Department or any of its frontline operational components after 120 days of enactment of this Act. (i) Sense of Congress It is the sense of Congress that the Secretary should endeavor to ensure that the majority of covered items for a frontline operational component procured by the Department are manufactured in the United States by entities that qualify as small business concerns. (j) Study Not later than 1 year after the date of the enactment of this Act, the Secretary of Homeland Security shall submit to the Committee on Homeland Security of the House of Representatives and the Committee on Homeland Security and Governmental Affairs of the Senate a study of the adequacy of allowances provided to employees of Department of Homeland Security frontline operational components (as such term is described in section 836 of the Homeland Security Act of 2002, as added by subsection (a)). Such study shall be informed by a Department-wide survey of employees from across the Department who receive uniform allowances that seeks to ascertain what, if any, improvements could be made to the current uniform allowances and what, if any, impacts current allowances have had on employee morale and retention. Such study shall also consider increasing by 25 percent, at minimum, the uniform allowance for first year employees and by 50 percent, at minimum, the annual allowance for all other employees. 325. Prohibition on operation or procurement of foreign-made unmanned aircraft systems (a) In general The Secretary of Homeland Security may not operate, provide financial assistance for, or enter into or renew a contract for the procurement of— (1) an unmanned aircraft system (UAS) that— (A) is manufactured in a covered foreign country or by a corporation domiciled in a covered foreign country