'Some' is plural, so plural form of the word/expression which follows it needs to be used. This applies equally to its derivatives like 'some of the', which also need to be followed by the plural.
“Someone has” is correct, because someone is a single person and thus equivalent to “he” or “she,” which are third-person singular pronouns, while “has” is the third-person present-tense conjugation of the root verb “to have.”
Job Overview As the Unit Supply Specialist, you'll be responsible for supervising and maintaining all Army supplies and equipment. You'll receive, inspect, inventory, load and unload, store, issue, and deliver all supplies and equipment. You'll also safely secure and control weapons and ammunition in security areas.
Unit Type means a dwelling unit with a defined floor area and a designated number of bedrooms.