well, they can be. So long as the pilot in question is stupid enough to fly within the SAMs firing envelope, kinda like in Firebirds, where one of the characters uses a Stinger too shoot down a Drug-Cartel owned Saab Draken that was strafing them... and then delivers a kick ass one-liner... "Snort that sucker!"
"Ditto" means "the same". As in, if two responses are asked for, and only one is required for both, the answer is provided, and the second query responded to with "ditto". In this case, the answer to both questions is Adobe Flash. So, rather than type out "Adobe Flash as well", I wrote "ditto". It's a pretty commonly used word.
All those ammo canisters fit into the launcher on the top. The DEMO canister is just loaded to show how the completed launcher looks. HEAT is the most commonly issued, because the main role of this weapon is Anti-Tank combat.
Yup. With the exception of the AA package, which fires a much longer missile, includes a shoulder stock and a modified optics and targeting package, all of these canisters are 105mm missiles of various types designed for the Silver Arrow launcher.