Before the Battle of Mogadishu, during a dinner scene, Steele comes up to Hoot and asks him what's going on.
Hoot replies: "Oh, just some aerial target practice, sir. Didn't want to leave it behind."
What is he referring to? It isn't his weapon, because Steele replies with: "I'm talking about your weapon."
In case you missed it, the scene starts with the troops having an impromptu barbecue with the wild boar killed by Hoot.
Hoot stands before a wild boar on a rotating BBQ spit. Men move along the chow line.
Hence, the "aerial practice". Hoot is referring to is the act of killing the beast in the previous scene.
EXT. HIGH ABOVE MARSHY WETLANDS - DAY 21
A herd of wild boars flees from the chopper.22 INT. SUPER SIX ONE - SAME 22
Upon sight of the boars Hoot cocks his rifle.HOOT: Hey, who's hungry?
The other Rangers smirk.
"Didn't want to leave it behind" is for the dead animal itself.
Adding to CinCout's answer; the follow on sentence
I'm talking about your weapon...
leads onto Hoot (and the audience) realising that Steele is actually asking why Hoot is walking around with his rifle's safety off - a big no-no on the base unless (possibly even if) on guard duty. Hoot replies
this is my safety, sir.
Referring to his finger. Here's the clip in question:
