The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure nine units of encryption-decryption equipment under the presolicitation notice titled "58--ENCRYPTION-DECRYPTI." This procurement involves the National Stock Number (NSN) 0R-5810-017078552-P8, with a reference number of 3392AS612-200, and requires delivery on a Free on Board (FOB) origin basis. The equipment is critical for communications security, and the government intends to solicit and negotiate with only one source, as per FAR 6.302-1, although all responsible sources may express their interest and capability to fulfill the requirement. Interested parties should contact Christina M. Foley at (215) 697-0484 or via email at CHRISTINA.M.FOLEY5.CIV@US.NAVY.MIL, with proposals due within 45 days of the notice publication.