| Answer | Crossword Clue |
|---|---|
| TRIALBYORDEAL | Difficult proving ground |
| TESTBED | Proving ground |
| TESTSITE | Proving ground |
| ABERDEEN | Maryland proving ground |
| TESTER | Proving-ground driver. |
| TESTS | Proving ground activities. |
| ENIWETOK | Atom bomb proving ground. |
| ENIWETOK | Atomic island proving ground. |
| ENIWETOK | Pacific atomic proving ground. |
| ABERDEEN | Md.'s ... Proving Ground |
| ABERDEEN | Army proving ground in Maryland. |
| NEVADATESTSITE | Proving ground NW of Vegas |
| ABERDEEN | Site of Proving Ground of U. S. |
| AERIAL | ... Images Inc. posted images of a hush-hush Air Force proving ground on the Web |
