(a)
Whoever, by any fraud or false pretense, enters or attempts to enter—
(1)
any real property belonging in whole or in part to, or leased by, the United States;
(2)
any vessel or aircraft belonging in whole or in part to, or leased by, the United States;
(3)
any secure or restricted area of any seaport, designated as secure in an approved security plan, as required under section
70103 of title
46, United States Code, and the rules and regulations promulgated under that section; or
(4)
any secure area of any airport,
shall be punished as provided in subsection (b) of this section.