MorioMortis said:

Unless you're a member of some Gung-Ho Regiment which is usually given the hardest task on the battlefield, suicidal assaults, dangerous infiltration missions or defense to last men alive. In that case even Munitorum can't suspect anything. But if you're Johnny Soldierboy sitting in a trench all damn war and you lose your equipment very often that could lead to accusations and possible death. Thats my oppinion.

MorioMortis said:

Giving the 'favored weapon' +10 to reaquire specialist gear would seem pretty reasonable to me. And as for logic and IG requisitions… You're kidding right? This is 40k, you're lucky if you order a case of krak grenades and they only send you a case of smoke grenades, as opposed to, say, an untrained sqiggoth that was supposed to be sent to an inquisitorial research base.

Unknown said "Dont be silly. Otherwise he could order one for every man in the squad. Same thing with heavy flamers. And that would be a frightful wast of the emperors resources." The GM could step in at this point and say "Thats a -60 Will-power test to waist the God Emperor's resources" "Why such an agreejus negative to the test?" The player asks dumfounded "The only thing your character has cared about sense the death of his parents is the God Emperor of mankind. He sees waisting resources as a bratrail to Him. There for a -60" "Can I still get one to replace my broken one for free." "By all means but the guy in the armory knows you have one now. You cant get one til after the next mission and if you have one working there's a WP test."Sorry for any mis-speeled words or gramarical errors Im doing this on a PS3. 

The thing is that, even a weapon specialist trained for use with flamers and starting with one of these, a heavy gunner with a rocket launcher or similar, a sergeant and so on, is still just an Imperial Guardsman.

The standard kit is, as described in the book as, the fall back gear. It enough to keep someone fighting, despite being out of ammunition for his otherwise special gear. And it's just for the most part that you do get these things back when you need to replace it. But, a droptrooper regiment who doesn't get their gravchutes simply cannot jump out of a valkyrie without surviving and a mech-infantry can't perform as quickly as normal without their chimeras. A weapon specialist without his flamer is just slightly less dangerous. he can still kill stuff, so he isn't any kind of priority.

note that even standard regiment gear is mentioned as almost always available, it also mentions that those things are +20 to get if a test is needed.

A commissar doesnt need a boltpistol. but he was probably awarded one at some time. Especially since its considered good quality. If he looses it, shame on him. They don't grow on trees. Keep track of your gear.

 Any word on how much ammo a Weapon Specialist/Heavy Gunner gets for their special weapon?

 I would say:
Long Las/Plasma/Boltgun/Melta/Flamer/Grenade Launcher: 2 Clips
Heavy Bolter/Etc.: 3 Clips