Free Dulce Base (The Dulce Files Book 1) by Greg Strandberg

three dead Grays in the mouth of the cave and the lights were beginning to dim, although they weren’t going out completely.
    “Into the rabbit hole, boys,” Charlie said with a laugh, and once again Turn admired him for his bravery, his courage, and his blind-stupidity.  The men did as well, for they gave a ‘hell-yeah’ and started forward.
    Fred’s group was moving ahead slightly faster than Charlie’s, mainly because Bobbie kept jumping up ahead, his enthusiasm to kill the aliens outweighing his sense of safety. Fred was able to hold him back, but they were getting out of formation because of it.
    “Pick it up,” Sammy said, and he pushed forward ahead of Charlie.
    Charlie didn’t protest, and a few moments later the men were at the cave entrance, the dead Grays at their feet, the lit-tunnel open before them.  The mouth only went a dozen feet before hitting the back wall, although the tunnel itself twisted to the right. They reached that turn and started around it.
    “Damn!” Sammy shouted, then fired three short bursts.  The Gray that’d appeared ahead of them fell to the floor, followed a moment later by its head, shot off at the neck.”
    “Whoo-ee!” Bobbie laughed, then whistled too for good measure. “Love it when that happens!”
    Charlie and Fred gave him a strange look as they reached the creature, and got their first real good look at the things they’d only until that point heard about.
    “Damn those eyes are lifeless,” Fred said, and Charlie nodded.
    “So’s their souls,” Paul said, the first words out of him since they’d gotten off the helicopter.
    “Why the hell’d that one just stand there and let itself get shot to shit like that?” Charlie said, his mouth hanging open in surprise and his eyes darting from one super soldier to the other.
    “Thought he could get me,” Sammy replied, looking at the two ‘commanders’ of the mission.
    “He didn’t know that Sammy, Bobbie and me ain’t susceptible to that mind attack crap,” Tommy said, in a serious tone for a change.
    “That’s why you all need to stay close to us,” Sammy said, looking at the others but especially at Charlie and Fred. “Stay close to us and you’ll be fine.”
    The men nodded and they started forward again.  The lights were still on, some kind of dull-yellow orbs built into the side of the tunnel, which was now beginning to turn to metal, the walls at least.
    “How far’s this thing go down?” Robbie asked no one in particular as they kept on moving.
    “It’s a shuttle port,” Paul replied, “could go on for miles.”
    “You said a half mile outside there,” Charlie said, turning to Paul.
    Paul shrugged. “It’s hard to say, though the intel on this one said–”
    “Shut up!” Turn said as loudly as he could without shouting. “Listen.”
    The others listened, then the super soldiers looked at one another and their eyes went wide.
    “Get down!” they shouted as one, then dove for the sides of the tunnel.  Fred and Charlie did the same, their training taking over for any lack of understanding, and a moment later a ‘whooshing’ sound of some sort could be heard.
    “Robbie!” Sammy yelled at the same moment some kind of UFO flew over their heads.
    “Got it!” Robbie shouted back, and he did, his M203 China Lake model grenade launcher pointing forward and ready. He hit the button and the thing fired to life, shooting out after the UFO as it was just reaching the turn to the tunnel entrance.
    “It’s not gonna–”
    BOOM!
    The missile-like grenade hit the side of the tunnel entrance just as the UFO darted to shoot out of it, cutting-off Tommy’s words. The missile missed, but the rocks that flew out and the other shrapnel didn’t, and the men all clearly saw the thing shudder and flinch and look like it would crash…but it didn’t.
    “C’mon!” Turn shouted, rising up faster than the others with the help of his cybernetic legs. 
    He was also able to dash down the