Human Resources/Office Manager

American Rheinmetall Munitions, Inc. is headquartered in Vienna, Virginia, with production facilities in Camden, AR, Texarkana, TX, and Windham, ME. The company is part of Rheinmetall’s Weapon and Ammunition division, specializing in large and medium caliber ammunition families, long‑range artillery, propellant technologies, mortars, infantry systems, and armaments. It provides the U.S. Department of Defense with precision, extended‑range, multi‑domain lethality solutions and supports domestic production and strategic partnerships.

About the role

This role provides flexible, day‑to‑day support across all Human Resources and office operations for American Rheinmetall Munitions (ARM). The position handles a wide range of HR and office management tasks, ensures compliance with legal and regulatory requirements, applies best practices, and keeps daily operations running smoothly. It adapts to immediate needs, assists employees and managers with routine HR matters, and maintains an organized, efficient office environment. The position is located in Vienna, VA.

Responsibilities

• Serve as the principal advisor to company leadership on all human resource matters, including employee relations, utilizing American Rheinmetall Human Resources or legal guidance as needed.
• Align ARM policies, forms, and HR practices with American Rheinmetall, including the employee handbook.
• Administer daily HR activities such as onboarding, off‑boarding, employment changes, and personnel file management.
• Coordinate recruitment efforts and develop strategies to recruit, hire, and retain qualified talent.
• Ensure company programs comply with federal, state, and local employment laws, regulations, and reporting requirements.
• Maintain an equitable and competitive compensation program and represent the company in the creation and administration of benefit programs.
• Implement performance‑management tools to provide timely, objective feedback to employees.
• Provide guidance and support to Rheinmetall Expal Munitions, S.A.U. (Expal) Human Resources.
• Oversee daily office operations to ensure a clean, organized, and safe work environment.
• Coordinate office supplies, vendor relationships, maintenance requests, and facility needs.
• Manage front‑office responsibilities including reception, visitor management, and mail distribution.
• Support leadership and employees with administrative tasks, meeting coordination, travel, and events.
• Act as the primary point of contact for building services, security, and external vendors.
• Organize company meetings, on‑site events, recognition activities, and basic communications.
• Respond quickly to changing priorities and manage urgent operational needs.
• Provide assistance across multiple functional areas (HR, facilities, safety, administrative support) and step into tasks outside typical HR responsibilities to ensure smooth daily operations.

Supervisory Responsibility

• Mentorship to Expal HR.

Requirements

• Bachelor’s degree in human resources, Business Administration, or a related field or 5 years of HR generalist experience that includes at least one year of project management.
• 5+ years of experience in Human Resources roles.
• Proven track record of successfully implementing HR initiatives and managing cross‑functional teams.
• 2+ years in a government contracting environment, defense or aerospace (preferred).
• Ability to obtain and maintain a Secret government security clearance, if required.

Skills

• Knowledge of HR principles, practices, and regulations.
• Proficiency in project management methodologies and tools.
• Effective oral and written communication with internal and external stakeholders at all levels.
• Collaboration with cross‑cultural teams.
• Analytical skills to interpret HR data and develop actionable insights.
• Ability to manage multiple projects simultaneously and meet deadlines.
• Familiarity with HR software and systems.
• Problem‑solving skills and a proactive approach to challenges.

Background Prerequisites

• Must undergo and meet company standards for background check, employment verification, reference checks, and controlled substance testing.

Working Conditions

• Primarily office‑based work with occasional travel.
• Extensive keyboarding and ability to work effectively via teleconference.
• Ability to work under pressure and meet deadlines.
• Physical and mental capacity to perform all essential functions, with or without reasonable accommodations.