OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has assigned a Long-Term Issue Credit Rating of “a-” to the $550 million 4.55% senior unsecured notes due Sept. 15, 2028 that were issued by Torchmark Corporation (Torchmark) (headquartered in McKinney, TX ) [NYSE: TMK]. The outlook assigned to the Credit Rating (rating) is negative. Proceeds from the sale of the senior notes will be utilized primarily for general corporate purposes, including the repurchase of existing debt and to provide additional ca