Contractors submitted proposals by Monday’s deadline for NASA’s second Cargo Resupply Services effort (CRS-2), which could feature multiple awards worth up to a combined $14 billion.Lockheed Martin [LMT] Civil Space Vice President and General Manager Wanda Sigur said Wednesday at its media day that the company responded to NASA’s request for proposals (RFP), but wouldn’t say which launch vehicle the company proposed. It could use one of United Launch Alliance’s (ULA) Delta IV or Atlas V rockets, though those are…