[snippy_about_it]

Orange can looks like a smoke grenade or tear gas. I see an M14 or an M1A, unloaded 30 round military magazines, loaded 20 round mags maybe 7.62 ammo. Except for the canister, unless it is gun oil it looks like a the back of a van of someone just back from the rifle range. However, most folks going to the rifle range aren't dumb enough to accidentally drive up to a military gate where they don't belong.

[driftdiver]

Could be innocent, that part of town is confusing and there is an indoor range a couple miles north. They might have been trying to ask directions. The gate guard probably saw the guns and did what they do.