Being really objective in the case of war reporting would mean not having an interest in the outcome. That is, not having a vested interest in who wins in the end. I assume the British reporters who went along on the Falklands war would have preferred the British to win. The reporting is one thing; the newspapers are another. What gets printed depends on the editor, along with which page it goes on. You also have to remember what news is. It's something that just happened. Something that happened a week ago is no longer news. Unfortunately, that means you usually don't get (as Paul Harvey used to say) the rest of the story. But if you don't eventually see the rest of the story, that doesn't mean it's being kept secret. It's hard to believe there are any secrets these days. If the Russians want to know where we have troops (just about everywhere), they can look it up on Wikipedia, although Wikipedia is by no means always accurate--or without bias.
Television reporting, however, is different. The dynamics are altogether different. You don't pick and choose what to read, although you certainly aren't forced to sit and listen to whatever happens to be on. TV news generally leads with something dramatic. Crime, fires, natural disasters and so on. The bigger the station, the more it becomes entertainment because they want to keep your attention. Network news even more so. I don't know how it could be different. Public radio is different yet again. Their news stories are long and quite in-depth. If only they could do a story without the sound of footsteps on gravel.
Propaganda is big news (usually) that is intended to make your side more impressive or stronger and the other side weak and ineffective. The object is to demoralize the enemy. The Germans in WWII were masters of the art, even though they were good at the art of war, too. But their propaganda was believed and still is, even if the plain facts are otherwise. The propaganda said they rolled through Poland and France, brushing aside all resistance. The facts are that those campaigns were hard-fought, even if the outcome was only barely in question. In the invasion of Poland, Germany lost about 1,000 tanks and armored vehicles and as many as 16,000 killed in action. In the invasion of France, they lost about 27,000 killed in action and about 800 tank. Doesn't sound like it was an easy campaign at all. Of course, they won both campaigns and the other sides lost more. Anyway, blitzkrieg was more propaganda than reality.