This costume was the quickest to complete as it was close to 100% intact when I purchased it. The helmet belonged to Eric Da're (of Twin Peaks fame) who is creditted as a medic in Starship Troopers. This helmet has been screen matched to the helmet worn by the lead medic called on by Sgt Zim after breaking cadet Brekinridge's arm.
Note: Only the upper body and helmet are shown in the images below. While not pictured, this is a complete costume, including a small supply case used as a medic's kit since the medic doesn't have any accessories.