Morgan's Mercenaries: Heart of Stone by Lindsay McKenna

this cave complex was through the “Eye of the Needle,” as they called it.
    The Eye of the Needle was a natural geologic wonder—a hole in the lava wall sixty feet high and eighty feet wide, just large enough for an Apache or Cobra to move very carefully through it. The rotor diameter on an Apache was forty-eight feet, so they had very little clearance at any time.
    Clouds also helped hide the base from prying eyes. Far below them flowed the mighty Urubamba River, a continual source of moisture rising upward in the tropical heat. As this humid air rolled up the mountainside, it met and mixed with cooler, descending air—exactly where the cave and their base was located, creating a fog that was nearly constant all year-round.
    This morning was no exception. They would be required to lift off and fly out on instruments and radar in order to thread the Eye squarely and not take off a chunk of their titanium-edged rotor blades, risking a crash. The operation wasn’t for fools or anyone not paying attention to her flying. After logging three hundred miles on a mission, the pilots were often tired coming back, and this obstacle became even more dangerous in their exhausted state.
    Glancing down, Maya positioned her chicken plate,the bulletproof vest across her chest and abdomen, so that it rode as comfortably as possible. The radio in her helmet crackled to life.
    “Black Jaguar One, this is Two. You read me?” It was Dallas Klein’s whiskey-smooth voice.
    “Roger, Black Jaguar Two. Read you loud and clear.”
    “Looks like we got split pea soup out there as usual, Saber.”
    Maya smiled as she hooked up her harness. Saber was her nickname, given to her upon graduation from army basic aviation school, when she’d gotten her wings. Everyone got a nickname. She’d earned hers because her company said she was like a fine-bladed army ceremonial sword, slicing through any situation with finality. The name Saber had stuck. Maya liked living up to it. “Roger that, Dallas. Nothing new. The boys comin’ up from Lima oughta be real impressed if this stuff hangs around the Eye like it usually does,” she chuckled darkly. She made sure the knee board on her right thigh was adjusted, in case she needed to jot anything down.
    Continuing her checks, Maya felt her left thigh pocket to make sure that her sister’s medicine necklace was in there. Inca had given her the protective necklace soon after they’d met, and Maya always kept it on her during a mission. She couldn’t wear jewlery, so she tucked it into a side pocket. It felt warm and secure in there and she gave it a pat of affection. In a way, it reminded Maya that now she had a sister to come home to, and to be careful out there in the skies over Peru.
    Chuckling, Dallas said, “Oh, I’m sure they’re gonna be real impressed, anyway.”
    “We’ll see just how tough the good ole boys fromFort Rucker are when they encounter the Eye. I’d give my right arm to see the looks on their faces when they approach it.”
    “They’ve been given prior info on it, right?” Wild Woman interjected from the rear cockpit.
    Maya nodded. She was ready. They were ready. Excitement thrummed through her. “Roger that, Jess. But looking at it on paper and seeing it in person, and knowing your forty-eight-foot blade has no room for error, despite the winds that are always whipping up from the river, is gonna make it real interesting for those boys.”
    Laughter filled Maya’s earphones. She grinned mirthlessly. Yes, she’d like to see York’s face when he came up against the Eye wrapped in thick clouds that were subject to the whim of the winds in this mountainous region. He’d learn to respect Eye real fast. Maya could hardly wait until they returned and she saw the two new Apaches thread it. There wasn’t a pilot around that didn’t approach it slowly and with a lot of trepidation.
    The crew chief moved toward the ladder. “You’re ready to go, Captain,” she said, and