The two servicemen sit at a bench in a laboratory doing an Rh run, one step in the process of doing a type and crossmatch. Humphries sits in front of trays filled with upright test tubes containing blood and writes on a chart. Banker sits next to Humphries and is in the process of testing a sample from one of the test tubes. In the background two other servicemen sit and work at the end of the same bench.
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