If you are struggling to find and retain good operations or office personnel, look at your profitability, look at how you treat your employees and look at how well you hold your leaders accountable for doing their jobs correctly.
Your ability to hire well is directly tied to your profitability. If you can't secure good, well-paying work you can't afford to recruit or retain the best workers. Now we've come full circle.
You need to hire great salesmen, or to be a great salesman (woman) yourself, to land well-paying work. Without them, you will not land good work. You will not be able to generate healthy profits. You will not be able to keep really good field, operations and office personnel. And that will lead to constant fire-fighting, blown budgets and never-ending sleepless nights.
As you can see, it's all inter-related. Great sales enable you to build a great staff.