D.C. Mun. Regs. tit. 17, r. 17-405
Application for examination shall be made on a blank form furnished by the Board of Examiners.
The class of license applied for, together with a statement of the experience of the applicant in operating steam boilers and engines with machinery, must be given and sworn to before a Notary Public in the form of an affidavit.
Except as otherwise provided in this section, each application shall also include the endorsement of three (3) reputable citizens of the District of Columbia, regarding the character and moral habits of the applicant, one of whom shall be a licensed engineer of the District of Columbia.
If an applicant holds or has held an unrevoked license as an engineer in another jurisdiction, the requirement for an engineer's endorsement (§ 405.3) may be waived.
The application for Class 7 - Portable and Construction Equipment Operator license shall include three (3) endorsers, as follows:
Each endorser shall certify that the applicant is personally known to the endorser, and that the applicant has the necessary experience and qualifications to entitle the applicant to a license.
If the Board of Examiners has any doubt as to the qualifications of an applicant, the Board may investigate the applicant's experience and endorsements, or may require a practical demonstration of the applicant's ability to perform the required duties of an operator. A competent operator may be asked to assist and advise the members of the Board if a practical demonstration is required.
Applications shall be filed in the office of the Board of Examiners by Thursday of the week of examination.
Each application shall be accompanied by two (2) unmounted full face photographs, 2-1/4" by 2-3/4" in size, taken not more than three (3) months prior to the date application is filed.
The license fee of three dollars ($3) shall be paid to the D.C. Treasurer when the applicant procures his or her license.
D.C. Mun. Regs. tit. 17, r. 17-405