Del. Code tit. 19 § 3351
If the Department finds that an employer's business is closed solely because of the entrance of 1 or more of the owners, officers, partners or the majority stockholder into the armed forces of the United States, after January 1, 1950, such employer's experience-rating record shall not be terminated, and, if the business is resumed within 2 years after the discharge or release from active duty in the armed forces of such person or persons, the employer's experience shall be deemed to have been continuous throughout such period. The benefit wage ratio or benefit ratio of any such employer for the calendar year in which the employer resumes business and the 3 calendar years immediately following shall be a percentage equal to the total of the employer's benefit wages or benefit charges (including any benefit wages or benefit charges resulting from the payment of benefits to any individual during the period the employer was in the armed forces based upon wages paid by the employer prior to the employer's entrance into such forces) for the 3 most recently completed calendar years divided by that part of the employer's total payroll, with respect to which assessments have been paid to the Department, for the 3 most recent calendar years during the whole of which, respectively, such employer has been in business.
19 Del. C. § 3351