Green Beret Bodyguard by Carol Ericson

He may have lost his memory, but not his mercenary skills. And once Jack Coburn learned his real name, he sought out the woman who could help him piece together the rest of his past. Lola Famosa had hired the green beret months ago to find her missing brother. And that mission had nearly cost him his life.

But someone was determined to keep Lola from her quest and her life hung in the balance. Jack's concern now was about protecting Lola. For she was the one thing this loner was determined to keep.

Last Spy Standing by Dana Marton

Black ops specialist Mitch Mendoza had thought this South American rescue mission would be routine. But the jungle held unexpected dangers: like Megan Cassidy. The undercover CIA agent had legs for miles and a hidden agenda. Soon Mitch found himself distracted by Megan's steely resolve and her soft curves. And he couldn't afford that if he wanted this assignment to be a success...and get both of them out alive.