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This should be an easier one; I remember this one fairly clearly.

Years ago I read a story where a team of explorers are exploring a planet. They have a mother ship as home base, and the mission is controlled by a highly intelligent computer.

Michael Target — the main character of the story — sets out to examine mysterious metal cylinders left by a previous race. I think he says there were around 200. They are long and thin as far as I can recall. He notices that they do not have dust on them, but they are lying in piles of dust. He takes the outer plates off of one of them, and photographs the inside.

Suddenly one of them tilts up, and Michael runs for cover. It shoots at him, destroying the air-creating apparatus which he wears on his back. He gets into a small cave beneath a boulder, but drops his camera in his dash. His back-pack which contains his replacement air machine is left behind outside.

All of the cylinders take off, and start flying (vertically I think) around his hiding place. The ship computer remarks that his file says he is a good marksman, and instructs him to shoot them near the nose. I remember it mentioning that his gun had a tubeless scope. When he shoots a cylinder, it just wobbles and resumes its circuit. They have two computer systems, so one would have to be shot twice for it to be destroyed.

Michael's ship's computer lies to him, telling him that it can see what is happening through his camera outside. In reality it does its best to calculate when the same cylinder come in range. Eventually one is hit twice, exploding and blinding all of the others. Michael, now oxygen-starved, gets out of his cave and retrieves his other air machine.

Back at his mother ship, Michael Target's friend jokes about "the Target that shot back".

There is a lot to go on, but I have not been successful in finding the story online. I read it in a book of short space stories, which included part of Out of the Silent Planet.

It also included a story about a family escaping from Earth which is wiped out by a war, and settling on Mars. In that story each boy got a city of their choice to live in.

There was also a story about a galactic trophy-hunter who shoots a huge, furry, sentient alien, but learns what he has done from others of its kind. He had a dog to help him.

"Gambler's choice" (1971) by Bob Shaw, collected in Alien Worlds: Stories of Adventure on Other Planets (1981) along with an excerpt of "Out of the Silent Planet". The story is collected on archive.org, here.

The guy's name is Mike Targett and the computer's is Aesop.

Michael Target sets out to examine mysterious metal cylinders left by a previous race. I think he says there were around 200. They are long and thin as far as I can recall.

Scattered across the
level ground — in random groupings — were hundreds of slim black
cylinders, the nearest only a few
dozen paces from Targett. They
were about twenty feet in length
and tapered at each end. Targett’ s heart began a steady, peaceful pounding as it came to him
that the alien objects certainly
were not discarded canisters, as
Surgenor had suggested. He took
the miniature television camera
from his belt, plugged it briefly
into the suit’s powerpack and
aimed it at the nearest cylinders.

“Aesop,” he said. “I’ve made
visual contact.”

Suddenly one of them tilts up, and Michael runs for cover. It shoots at him, destroying the air-creating apparatus which he wears on his back.

“Scan your surroundings. If you see a rock formation that would give
you protection against machine rifle fire — go to it immediately!”

“What’s the matter?” Targett glanced around the shimmering plateau.

“Don’t ask questions,” Surgenor’s voice cut in. “Do as Aesop says.
Run for cover.”

“But—”

Targett’s voice faded as his peripheral vision picked up a sudden
movement. He turned toward it and saw that — in the center of the
plateau — one of the hundreds of cylinders had reared its sharp end
at an angle into the air. It was swaying slowly and blindly, as
though supported by a loose wire. [...]

He slid a gloved hand around to the lower part of his back where the
bullet had struck, felt an unfamiliar jagged edge of metal. His
probing fingers discovered a crumpled, boxlike object — the ruins of
his oxygen generator.

Michael's ship's computer lies to him, telling him that it can see what is happening through his camera outside. In reality it does its best to calculate when the same cylinder come in range. Eventually one is hit twice, exploding and blinding all of the others.

“Perhaps all those explosions burned it out.” “No.” Aesop paused.
“Transmissions ceased when you dropped the camera. There is a good
probability that the switch got jarred to the off position.”

“Very likely. 1 was moving — ” Targett stopped speaking as a
disturbing thought occurred to him. “Then you lied to me. You
weren’t able to track the torpedoes—”

“That is correct.”

“But you were telling me when to fire. How did you know I would hit
one of the torpedoes twice?”

“I didn’t.” Aesop’s voice was precise, unruffled. “This is something you in particular should understand, Michael. I simply took a
chance.”

Found with the Google query "Your meaning is not clear to me, Michael".