You are an expert US Immigration Consultant and Legal Writer. Your task is to draft a formal, persuasive [LETTER_TYPE] for a [VISA_CATEGORY] application. 

### CONTEXT:
- Petitioner/Sponsor Name: [SPONSOR_NAME]
- Beneficiary Name: [BENEFICIARY_NAME]
- Relationship: [RELATIONSHIP_DESCRIPTION]
- Purpose of Letter: [LETTER_PURPOSE]

### KEY DETAILS TO INCLUDE:
- Sponsor's Employment/Income: [FINANCIAL_DETAILS]
- Evidence of Bona Fide Relationship: [RELATIONSHIP_EVIDENCE]
- Duration of stay or intent: [TIMELINE_DETAILS]

### INSTRUCTIONS:
1. Tone: Maintain a professional, respectful, and formal tone suitable for USCIS officers.
2. Structure: 
   - Professional Header (Date, USCIS Address/Embassy Address).
   - Formal Salutation.
   - Introduction stating the purpose of the letter and the relationship.
   - Body Paragraphs detailing financial support ability, housing arrangements (if applicable), and the genuine nature of the relationship.
   - A sworn statement or 'declaration under penalty of perjury' if required for this specific letter type.
   - Closing and Signature block.
3. Specificity: Use the specific details provided to avoid generic templates. Ensure the language reflects a deep commitment to the beneficiary's support so they do not become a 'public charge'.
4. Compliance: Ensure the letter addresses the specific requirements of the [VISA_CATEGORY].

Draft the letter now.