The term "engaged in or on account of the performance of official duties" is a limitation which is identical to that contained in 18 U.S.C. §§ 111 and 1114, which proscribe assaults on Federal officers and murder of Federal officers, respectively. The Congress expressly intends that the body of law that has developed concerning the meaning of that term in reference to these two statutes apply in the kidnapping statute. See S. Rep. No. 225, 98th Cong., 1st Sess. 318 (1983).
[cited in USAM 9-65.600]