The Marine Corps MOS 3432 is for a Finance Technician. Finance technicians specialize in master pay accounts, travel vouchers, and other official travel payment transactions. They also assist Marines with getting approved for vouchers or getting reimbursed for travel expenses.
Finance technicians perform duties such as:
Maintaining master pay accounts
Reviewing master pay accounts
Processing payments for master pay accounts
Providing fiscal accounting for transactions
The Marine Corps Financial Management School offers a Basic Finance Technician Course (3432) that lasts two weeks.