Sorry, no online dictionaries contain the exact phrase become operational.
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Reverse dictionary results:
1. activate
 2. start up
3. initiate
4. launch
5. begin
6. oncome
7. set forth
8. start
9. come out
10. file in
 11. move forward
12. set
13. start out
14. advect
15. approach
16. bring out
17. broach
18. check out
19. come out with
20. come to light
 21. come up with
22. commence
23. dawn
24. drum up
25. end up
26. gravitate
27. ingoing
28. inroad
29. issue
30. make an appearance
 31. make time
32. onset
33. outsetting
34. progress
35. put forth
36. set on

You can look up the words in the phrase individually using these links:   become ?   operational ?
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beco*to search for words beginning with beco, or
*onalto search for words ending with onal
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