Can I permanently miss items on missions?

See above, also if not where can I find said items after I complete the mission? I have the guide and realized I missed something in the first real mission, and am wondering if I should just start over or go on without it.

Submitted Answers

From sirdryden on Mar 8, 2012 8:26 am GMT

Just like ME2, some areas are only playable once, and anything you miss is gone for good. Sorry :(
From ryuujinn on Mar 9, 2012 5:58 am GMT

I do believe that certain items, the ones that open up minor fetch quests, can be purchased at the Spectre terminal if you miss them. But as for weapons and mods, I think you only have one chance at them.
From pyromite on Mar 11, 2012 3:36 am GMT

Everything you can pick up on the missions can be bought in the shops. If you miss armor or a weapon upgrade, you can pick it up in specific shops on the Citadel. To check real quick, you can use the requisition screen in the armory on the Normandy and look at all the shops to see if they have any new stock.

Quest-specific items are always found in the Spectre shop.
From DeadinOne on Mar 11, 2012 5:29 am GMT

For every mission except gathering intel on Eden prime (it's an achievement too), if you miss the item, you can purchase it from the Spectre store. You only get one shot at any planet/area, but besides Eden Prime, it's not to big a deal.
From Jwall33 on Mar 12, 2012 4:26 am GMT

You can also permanetly miss the dog tags on benning. but usually anything that results in war assests being obtained can be bought at the spectre terminal for, what ive seen, at most 1000 credits.
From WOWGODnot on Mar 18, 2012 11:43 am GMT

This video will explain how to complete this game 100%. You guys should check it out.
www.youtube.com/watch?v=Oe4qEH4y69M

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